Sore abdomen?

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My lower abdomen feels like I've done 400 sit ups (I'm dramatic, but really, it's super sore). AF is due 9/9, I had brown discharge once on the 29th (some have said it could be from ovulation). I don't remember having this feeling when I got pregnant with my daughter, but it's been a while (she's 3). Has anyone felt anything like that?