Birth control

Tammy
Hey everyone I just have a general question. I was on birth control for over 5 years after my daughter was born and this past February they changed it to one without estrogen because I'm 31 and I would continually get migraines. I had my period last on February 14. I recently, about 2 weeks ago stopped my birth control completely cuz me and my boyfriend want to have a baby. How long is it going to take for me to get pregnant? Can I get pregnant? I had spotted about a week ago I have taken 4 prego tests randomly and they are all negative but I feel drained  and feel almost like I'm pmsing or possibly prego. Help! Thanks !