I think really the only way to tell if you are ovulating is by temping or using OPKs. I have read that it's possible to get

even if you don't ovulate, although it might be less regular and lighter. I am also waiting until next year to TTC, and taking this year to get myself healthier and ready for

. It sounds like if you already got your cycles back (did you get

while on the depo?), then it's a good sign. It seems like a good idea to temp before you actually try so you know which days you should bd, so it's the most effective when you actually try (of course I'm sure your DH would argue that you should 'practice' even when it's not the most effective time!).
Good luck, and let us know how you're doing. We'd love to hear a success story!