ovulation bleeding???

Jamie
Hello everyone,
So I have very irregular periods and my partner and I had sex 3 times during my what I hope was my ovulation days. The app says I'm supposed to start around the 15th I've had minor cramps the last few days and feeling sick to my stomach. This morning I actually started bleeding as if I started my period..it's not super heavy but it is constant and I have had cramps all day. Is this my actual period or could it possibly implantation bleeding??