So I had sex on the 23rd of April. I took the morning after pill 3 days later which said that some uncommon side effects are vaginal bleeding and back pain. I took a pregnancy test two weeks after sex, when I was 5 days late for my period. and it was negative (but I'm aware you can get false negatives). The day after I took the pregnancy test I got my period. But It's just in the back of my mind...what if it's not my period, and it's just a side effect of the pill. I also got back pain but I always do when I'm on my period. My period seemed how it normally is but I'm just worried that it's not actually my period. So, how do I tell the difference between the morning after pill side effects of vaginal bleeps Or my actual period? Or even implantation bleeding? Am I just over thinking this?