I believe that I had a miscarriage

Maddy • Happily with a super dork that I love dearly•Skeletøn Clique•Superwholock
I got the Depo shot on August ninth and had unprotected sex August 21st and I believe that my man may have gotten some of his cum in me and on September 4th I started my period it was extremely light and was almost like spotting and was with dead blood until Thursday where it was fresher blood and was about medium and then yesterday it was extremely heavy and then last night I passed a clot that was white ish in color and looked almost exactly like all the pictures of the miscarriages of about three to four weeks which would be the right time frame for me. I'm just very scared and upset over this. I told my man he thinks that I may just be overreacting or that it may have just been a strange clot and not a miscarriage but I know in my heart that it had to have been. You know those feelings that you get that you just can't shake? This is one of those. Does anyone else agree that I sound like I had a miscarriage or am I just overreacting?