What could be happening ?

Brooklynn • happily married, Rainbow Baby 🌈 born November 08,2019. 👼🏻 RIP Angel Baby

7 days late for period per app which it’s usually on time for maybe a day off but never like this. Have taken several test all negative but now I am feeling nauseous and just over all fatigued tmi and having a lot of bms. Has anyone else gone thru this and ended up actually pregnant?