hellllppppp!

Okay so my period is due 23-25th. My husband and I BD about 2 hours ago and right after I got cramps like I was about to start my period. Went away shortly after and just now as I was getting ready for bed I went to the bathroom and noticed some blood in my undies but nothing when I wiped. Could this be implantation bleeding or just From sex? I did go  to bathroom right after sex and there was no blood. Don't wanna get my hopes up and I'm waiting to take a test if i miss my period. I'm 9-11 days DPO according this APP.