HELP! 12-13 DPO with FRER BFN

Guys I’m losing my mind over here.

We’re trying for baby #2 and did everything “right”. Had sex every day if not every other day the day after my period ended up to and even after ovulation day. My cycle is 27-28 days and always regular. I always get ovulation symptoms. I got a UTI the morning of ovulation according to this app (another app said I ovulated the day before). No matter, I got antibiotics and it was gone right away. Here I am, 2-3 days away from my period and nothing but blaring negatives. What are we doing wrong?? I have so many up and down symptoms: nausea, cramping, backache, so fatigued, mood swings ... these all started 6-7 days post ovulation. But all negative. I usually will cramp and have a backache before AF but not 9-10 days before, more like 1-3 days before. I’ve been testing everyday since 9 DPO. Help!