Period tracking help

Hello!

Hoping for some period tracking help!

My last period was from February 2 - 5, and one app sid my ovulation was the 16th and predicted next period was March 4th

But another app said, period start tomorrow March 6, and my ovulation should have been around March 19th.

I haven't gotten my period, and had unprotected sex on Feb 14th (haha yes valentines day)

I had a lot of pelvic achiness/pain, fatigue, clear sticky cervical mucus, and nausea around February 25-March 1.

No signs of period yet, usually I'd have spotting by now as I always do before my period.

I just feel like my tracking was on point, but because February is 28 days maybe I messed up?