I`m about two days late. Yesterday I took a pregnancy test it came back negative. However the line was VERY faint. If I am pregnant would it show up now if I had sex at the end of June? I`m not sure why I`m late. I`m never late. I started a new medication for migraines 3 weeks and I`m not sure if the medicine caused a change in my cycle. I talked to the pharmacist and he said the medicine only causes bleeding into between periods. so I`m not sure what to think!! Should I retest? Why was the line so faint?