A lot of positive opks

Hi guys! So my husband and I had a miscarriage 3 months ago. We started trying as soon as I got a neg pregnancy test. I’ve been taking opks and I had my surge but they’ve been coming back positive and dark for 4 days straight. Even if I don’t withhold drinking or anything. I’ve been a little crampy since last night and I felt cramping the day before my surge. Has this happened to anyone else??

Oh I even have a app that tells me how strong the positive is and the numbers aren’t going back down.