Can anyone relate?

Hello! I'm new to this App! My husband and I have been TTC since December so it's only the beginning of our adventure. I had tested positive for POS in the past but that was years ago and I've read that it can be a false positive. I've never really looked more into it. I do have a period every month for the same number of days but sometimes I'm a few days late or early. These past 3 months I've been on spot for the 3rd but last month was the 2nd so pretty close. Anyway, we tried a lot during my fertile days according to this app but I didn't "feel" like I was ovulating (I usually get really crampy with a lot of discharge). A few days after the app said my fertile days would be over I felt like I was ovulating so we tried a lot again. It's the 2nd and I still haven't started and my boobs hurt really bad. I've taken 2 tests and they both said negative. Has anyone ever had a negative result but was pregnant? Also has anyone ever used pre-seed lubricant? Looking into it if we are not successful this month.

Thanks!!