Try First Response pregnancy test. It can pick up early on if hcg is present (the hormone produced in pregnancy). Sometimes the body miscarries at times. Also if you didnt have sex in a long time, and then you do your body starts changing hormonally even if ure not pregnant. Look for indications of pregnancy, such as frequent urination. You'll feel quite full. Also nausea. Your breasts will enlarge fast if say for instance they were normal size. And then if u had sex like a day or two after sex they start to enlarge. Hope this helps.
why do talk about april and may as the first and second month? why do you think your pregnant. you keep getting negative pregnancy test so its not likly that your pregnant. get a blood test if you really doubt the accuracy of pregnancy tests
are you trying to get pregnant? are you having unprotected sex? How long are your normal cycles?
The best thing to do is to see your doctor since you seem really concerned. They will give you a blood test. Plus, you dont give too much info like "are you on any form of birth control?" If you are how long have you been on this particular kind? did you miss a pill or pills around that time? These are important things to post if you want an accurate anwser.