I want a baby so bad!!!!

My husband and I haven't exactly been trying but we haven't been not trying. if you know what I mean for 5 years. my cycle has been so messed up and 07 think its from my weight. they were extremely irregular. like I went from a year without one then had one then another year to spotting everyday. my doctor did blood work and gave me a pap and an ultrasound and didn't find anything. I then got on birth control which fixed the period. it's been four months since I started birth control. do tall think it'll be ok to get off of it and start actually trying or should I stay on longer