Pregnancy scare

So me and my boyfriend had unprotected sex on the fourteenth and is now the twentieth and all I've had so far is like super heavy discharge like it feels like it's my period but it isn't. I'm also having cramps like if I am gonna have my period but it's not here yet. Any ideas of what it may be or am I pregnant?

I forgot to mention that he came once but not it me and we continued to do it. That's why I'm a little scared. When he came the second time he came outside of me again.

My latest period has been on the 30th and I also had sex(with a condom) on September 2nd. I took a plan b pill that day. According to the app my period is on Sunday. Would it just be plan b effects?