Waiting to test after AF?

So last night was interesting. I was just in the kitchen and had a sharp shooting pain from my belly button to my pelvis (honestly, it felt like I had to poo! 🙈) so I went to the bathroom, and then had light spotting immediatelyfollowing the pain. AF was due today and I can only assume that's what my bleeding is now, but it feels different. 🤔

Has anyone tested after AF or medium bleeding and got a BFP?