I had unprotected sex on the 28th April and took Postinor2 immediately after that. 5 days later, I got my period in May. I also got my period in June and it was normal. I just got my period 2 days ago, but on the 3rd day, it seems to have lessen by a lot. I have tested negative twice. Is it possible for me to be pregnant? Why did my period lessen suddenly?

If you had sex this last month, but no, you will not have two regular periods, and be pregnant, there are many reasons women have light or changed periods, even miss one, now and then, this does not sound like pregnancy at all

I doubt you are pregnant. How old are you? There are lots of reasons to have a light period.