I need some opinions!

I had a miscarriage july 10 and then BD on July 23 the app says that was the beginning of my fertile window and I felt as I was possibly ovulating it is now 2 weeks from then and I don't know if it's all in my head but I feel as if I may be having symptoms as in I have excessive thirst, can't sleep, nauseous, and gas and I took a pregnancy test just now and it has a vvvfl and right now I'm wondering if it's possible it's a new positive? Or if it's just residual from my lost pregnancy any opinions would be wonderful!