What should I do ? 😱

In 2014 I got pregnant for a someone who at the time I was in a relationship with. A month before I started getting pregnancy symptoms he left me and moved back to his home town without telling me. At that time I didn't think I was pregnant I thought I was just sick, so one night a week later I was taking my bath and I saw something floating in my water (which was very weird cause I'm a clean person) I looked at it closer and it looked like a little shrimp almost I touched it and it had eyes, almost hand that wasn't fully developed, a tail, and a line that felt like it could've been a back bone. I was so scared I didn't know what to do! I was cramping and bleeding bad but I thought it was just a really heavy period. So I googled what babies looked like at very early stages and it resembled almost exactly what I saw! I was so scared I was shaking, heartbroken, and depressed so much was going through my head. I never went to the doctor to check on it because I wasn't old enough and I was scared to tell my parents. To this day in 2017 I still feel bad about it and wonder what if. But sometimes my period comes really really late, short, and heavy and I don't know what I should do. In another relationship my boyfriend tried to get me pregnant multiple times but It just seems like I can't now. I want kids but idk if I can get pregnant. Idk if the doctors can check for miscarriage 3 years later. Can someone please help me decide on what I should do.