Implantation bleeding?

Sara

My husband and I have been married for 7 years this September, and we married young (I was 20) and we decided to wait to have kids. We are not actively TTC, we use BC during my fertile week. Our thoughts process is if we get pregnant we are married and will take it as a blessing. How many of you all experienced implementation bleeding, and how much/little? We had unprotected sex the 12th and I was supposed to ovulate the 17th and today ( the 22nd) I see a small amount of blood in my CM. Is this me over thinking things or is this implantation bleeding?

Sara