TTC CM HELP!

Hi, I am trying to conceive and I am at the point in my cycle that I have the lovely egg white furtile mucus. I have just wiped and found a really dark red almost brown egg white display on the tissue. (This was not like implantation bleeding as it was too much blood. The whole CM was coated/coloured in the blood concoction) I did not get a picture. I did the BD yesterday, day before my furtile phase started and I know it is too soon as ewcm only started today. Anyone had this before? Any ideas what it could be? Shocked me a little as my periods run like clockwork and I always have the same things happen at the same time each month. Update, I wiped again tonight and find this. BTW TMI. I am getting worried now.