Has anyone experienced this?

Lizzie
My last proper period was 27th Nov - 3rd December my husband and I had Sex on 10th Dec & 13th Dec (on the 8th I ovulated) but a couple days after the last time we had Sex (13th Dec) when wiping I noticed CM but it was a light pinky colour, a day or so after that when I wiped I noticed about 5/6 specs of blood (never experience anything like this before) a day after this I felt a cramp like pain. Anyway to cut a long story short my period still hasn't appeared on the 31st Dec took a test and I think it was a negative. However that same night I noticed light bleeding when I wiped assumed it was my period then 1st Jan came and it was dark brown ?blood I assumed my period has come but today it appears to have stopped - really confused but my husband and I are indeed trying to convince. Does anyone n know what happened to me or can hazarded a guess I'm a bit worried.