Miscarriage with hope 💛🙏🏼

I miscarried my twins at 6 weeks and a couple days at the beginning of October. Has anyone used different apps to track their ovulation day? I use this app as well as p tracker. The days of ovulation are way different from each other. I took a pregnancy test (based off the p tracker that says I’m supposed to start my monthly in 3 days) but pregnancy test came out negative 😔. But on this app it says my monthly is supposed to come in 7 days so I’m hoping it was just to early to detect any hcg.