Am I pregnant?

So the last time I had my period was from April 23rd to April 27th. 
I had sex on May 6th and that was one of my fertility days. I'm basically in a relationship and we don't use any forms of birth control but I was supposed to have my period last week and it didn't show. 
I also had sex today but now my stomach is hurting me as well as a little bit of light bleeding. 
Is it possible that my period is trying to come on or is it implementation bleeding? 
Help me out ladies please 😭❤
Also I took a pregnancy test a couple of days ago and yes it did come back positive, I just know sometimes it isn't always accurate