Tiny blood clot after period

I just got a tiny blood clot that was smaller than my the finger nail on my pinky and it also had snot like cm with it. My period ended on the 23rd of December. Right before I got the little blood clot I had watery cm. I had unprotected sex 3 times in little over 2 weeks. One was right after my period ended and then on the 29th (I had a pinching pain in one of my sides) and then again on the 2nd of January. Then today is when I got the clot... has this happened to anyone?