HELP! PLEASEEEE.

i'm 21 almost 22. TTC. i was on depo when i was 17-18 off of it for a long time. then got back on it in December. i only took the one shot then started the pill. i went through one cycle of the pill then stopped. so i haven't been on BC since march. i also haven't had my period since then. when i was on depo my period stopped. is there anything i can do to get my cycle regular to conceive or any ideas? help.