Period only lasted 3 days??

Rylee

I usually have 5 day periods. Not only did I get my period 2 days late, but it also only lasted 3 days and wasn’t heavy like it usually is. Only passed 3 very small clots the first day and then no more, which usually I pass a lot. Now, I’m only bleeding during sex and spotting after. Could it be implantation bleeding? Could I be pregnant? What is going on?? Anyone have any insight for me?