Possible trigger * warning * / TMI

So, a few weeks ago my SO came inside me and although we weren't necessarily trying, we were ok with the possibility of pregnancy. Anyways, I did experience sore boobs about a week before my period started which were a little more intense than usual. It was way heavier than normal so I've been using tampons & pads together. Today, when I pulled out my tampon, I saw this.
The pictures are kind of blurry but it was definitely not just a blood clot, I used a q-tip and it had an unusual thick texture to it & when I searched google I saw this on miscarriages:
I just want to know if anyone has experienced this and thinks / knows what it is.
Thanks ladies.

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