Brown blood after sex

My last day of my period was 7 days ago. Last night, I finally got to have some sexy time w my boyfriend. After sex, I went to the bathroom and noticed there was brown blood. It got on the sheets and on his condom too. Any idea why? I am not bleeding to the point where I need a tampon and the blood is brown/old looking. No pain at all. Sex wasn’t rough. I’m not on birth control at all. I have always had normal periods. I Take an anti thyroid for my hyperthyroidism which I’ve taken for years. I do take iron, B12 vitamins also. Any ideas? I’m 30 years old, no kids.

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