Week 4

By the end of this week, you will most likely be expecting your period to come. However, if you are pregnant your period will most likely not come. Some women do experience some spotting or even a light period. It is also possible to have your period and still be pregnant! If you do miss your period, you might begin to think about a possible pregnancy! Home pregnancy tests are not as reliable as blood tests at this point. A blood test will detect a positive pregnancy test at this point because the hormone, human Chorionic Gonadotropin (hCG), has been secreted.

At this point in your pregnancy, your growing baby is very small and is about 1 mm in length. One mm is about half of the size of a typed letter `o`. You are still not showing at all and you have not yet gained any weight. Even though you are in the very early stages of your pregnancy, many great changes are occurring. The implanted embryo is embedded deeper in the lining of your uterus and the amniotic cavity is beginning to form. The placenta is also forming and will be delivering oxygen and nutrients to your developing baby. This week the blastocyst begins to transform into an embryo. The embryo will have three different layers with different types of tissue. The inner layer will form the lungs, liver, digestive system and pancreas. The middle layer will become the skeleton, muscles, kidneys, blood vessels and heart. The outer layer will become the skin, hair, lenses of eyes, tooth enamel and the nervous system.

A clear result. If you tried it a few days ago and the result wasn’t as convincing as in this picture,
try it again now to be sure!

Even though you have not yet gained any weight, you need to be prepared to gain weight during pregnancy. Gaining a healthy amount of weight is crucial for the health of both mother and baby during pregnancy. You can control your weight gain by eating healthy and nutritious meals and snacks. During pregnancy you are eating for two, but that does not mean you have to eat twice as much!

Your body now starts producing a hormone which stops you having your period, and it shows in your urine.

It is now possible for your pregnancy to show up on blood tests, and even home pregnancy tests.

About 1 in 3 women have a light bleeding at this point. This happens before you would expect your period to arrive. Unless accompanied by cramping, backache or increased bleeding, a small amount of blood being discharged should be considered as implantation bleeding which is nothing to be concerned about.

At this point, your baby is still not visible to the naked eye.

See also:

Ovulation Calendar (When can you do a home pregnancy test?)

Home pregnancy tests


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  1. FireDancer254 12 March 2015

    Hello! Anyone else out there!? Pretty sure I got a faint positive this morning! Eeek!! My cycle isn't due till Wednesday so testing again tomorrow and hoping for a darker line!

  2. FireDancer254 14 March 2015

    Hi Scooby! I took another test yesterday and the line was darker! Yay! I posted the pics on my profile. I am so excited to finally get my bfp :D

  3. FireDancer254 15 March 2015

    I told one of my close friends cause she knew we were trying and I told my mom. I want to at least get to go to the doc before I tell anyone else. I haven't decided when I am going to tell my kids yet. Once I tell them the whole world will know LOL so I may wait till I at least get to hear the heartbeat :)

  4. Mother23 15 March 2015

    I found out before I was 3 weeks. I'm going though implementation bleeding, which I think is almost done. I'm also dealing with relax, turns out I can't eat a lot of foods already.

  5. FireDancer254 16 March 2015

    Woohoo! Officially 4 weeks today! It was so great to wake up and not have AF :D Now it really feels real! I can't wait to get back from vacay so I can make my first doc appointment!

  6. feliciajay 19 April 2016

    I joined this group back with my first child in 2008 and loved it. Here I am again almost 8 yrs later doing the same thing again. Shocked and terrified still. Like does it cross your mind will you be able to love each child equally? I know it sounds crazy but all my love is for this little 8 yr old and now I'm terrified of this little being being created within me. I hear it's normal to wonder and be scared but I've never been so scared in my life. First trimester scares me more than anything. Exhausting

  7. mrsdownie5 14 May 2016

    Hi everyone am joining this group again as i have loved it with my other pregnancies i have 5 kids and currently pregnant with NO6 though not had an easy start already just hoping this baby sticks and i have a smooth pregnancy as i haven't had the easiest year so far. found out i was expecting last week on hubby birthday :) wish use all the luck and happy heathy pregnancy. to get more blood done and another transvaginal u/s on monday so getting nervous hoping to see a wee scan this time xx

  8. mrsdownie5 16 May 2016

    hi so had another transvaginal u/s today and am about 4 weeks 3 days saw the sac after all my worrying so guess was 3rd time lucky at scan at to go back 6th june to check baby and heartbeat then have my first main booking appointment on 15th june :) starting to see more real know and get very excited xx

  9. maieliieva 19 July 2016

    I've just found out I'm 4 weeks pregnant! Can't wait to tell my husband when he's back from a business trip!

  10. spacystaci53 15 February 2017

    Got my BFP, tomorrow will be a week since I tested! Thinking I will be 5 weeks tomorrow, Dr. Appt will confirm which is next Wednesday, 2/22!!

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