Depo Shot

So Ive been on the depo for 6 years and just recently stopped it (my ob suggested it). She suggested I stop it for a month as its eating away at my bone mass and density along with Ive been packing on the weight yet Ive always been really tall and slender along with severe migraines to the point I was vomiting constantly. Anyways Ive been off of it for a month and was planning on getting back on it, but I suspect I might be pregnant? My question is how long did it take you to get pregnant after getting off of the depo? The depo stays in your system for a while and I know for most women it takes a year or more to conceive after stopping it. I havent had a real period in all of those years so Im not sure when Im fertile or when I ovulate, but when I go off of my periods before i started the depo it says ovulation day is the 19th 20th which makes me freak out as we had sex the 16th and the 19th. And before you say protection i mention it all the time to my fiance and he doesnt take me seriously yet he had made it very clear he doesnt want anymore kids and Id consider a different method of birth control but im a forget person so pills isnt the best option. Id consider the arm one, but have a bleeding disorder. Please no bashing. Thank you.