Answers Girls PLEASE😔😣

So the day before my official ovulation day my boyfriend and I got together. I may have gotten precum on my vulva or there may have been some on his fingers and then he inserted them into me. 
Anyways I got my period a day earlier than expected but I didn't find it a big deal because I've gotten it on that day before. It was normal at first; I had all the PMS symptoms beforehand and it was nice red dark blood. I had my regular bad cramps that I experience and my period stayed like this for about 3 days. It wasn't super heavy, little lighter than normal, but still filling tampons and was red blood. Then for the last 4ish days of my period it tapered down and got pretty light. It was more pink and at the very end brown. I was barely bleeding for the last 4 days. Was this implantation? Could I even be pregnant?