Where to start?

Ashley
I need some help on where to start. I have been on and off birth control since I was 16 (26 now). My husband and I started TTC 4 months ago. I have not yet had a period since coming of birth control, and also I don't know how long my cycles actually are so tracking with the apps isn't helping much bc my fertile window and projected period keep changing. I feel like I have some pregnancy symptoms (fatigue, sore nipples) but I get a BFN when I test. I'm not sure if it is too soon to test bc I don't know when I ovulated or when my period will be. Any thoughts?