Pregnant?

This is my first month off birth control and ttc. I have not had a normal period yet so I have no clue when or if I ovulated this month or when my period will come. If it stays regular like it was on birth control, af is due on sept. 23. But I have no idea. I have tested the last 3 days because I feel pregnant. I have bloating, lower back pain, mild cramping, increased appetite, increased sex drive, very sore nipples and tender/ full feeling breasts. The tests were all negative except one that had a very faint line, but not sure if it was real or an evap. Is it possible I'm pregnant and it's just to early to show up? When should I test if I have no idea when to expect a period?