Faint positive 10 DPO but have AF like cramping??

This morning at 10 dpo I took a FRER & got a faint positive. I’ve been having AF like cramps for the past couple days but today they’ve gotten stronger. Not super painful. More like heavy, dull feeling like it could come today. Is this normal? AF due in 4 days. I had a mmc back in May so I’m really nervous! Please let me know if you’ve experienced this & if it was a successful pregnancy!!