bleeding during ovulation after sex !!pls explain

My bf and I had slightly rough sex yesterday during the first day of my ovulation. We stayed protected with a condom. My vag hole felt slightly swollen afterward till later this morning and then a few hours ago I realised my discharge instead of being clear looks like a light flow of period blood. 
During ovulation in the past I've had slightly bloody sticky mucus discharge and I heard it happens to a few ppl but this time the consistency seems bloodier and the flow is a little more liquidy altho still kinda sticky 
Please give me possible explanations for this 

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