Fertile Window & Spotting?

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Today starts my fertile window and I'm not peaking yet. My SO and I just BD about an hour or more ago. I went to the bathroom to pee and do an opk and noticed a little blood in my urine and light pink on the toilet paper. My periods are irregular but ive had super sore nipples, ovary pinches and nausea. I dont think AF is coming. Is it abnormal to spot during your fertile window?