Blood clot during ovulation

Chelsea • My sweet hubby and I have been together since 2009. Our sweet Madilyn Ann born 11/5/16! We`re finally complete!
I'm in my fertile window right now. I was at my peak day today. Husband and I bd mid-day. A few hours later I went to the bathroom and I noticed a blood clot in the toilet. There was no visible blood when I wiped so I was shocked to see a dime sized clot in the toilet. Is this normal? Has it happened to anyone else? I've never had this happen before.