Don't know what to do now....?

so i quit my bc pills in dec 08 to try and get pregnant again ( i have a 4 yr old). well i didnt have a period at all.. so in may i went to the doc and she gave me provera pills to induce my period.. so i took them and had a period may 28-jun 2. So i was thinkin i would start back, no luck. no period (again!) and no bfp. weve been tryin since jan09, and i rlly didnt think it would be this hard!! why is it that when you dont try it happens, and when you do it doesnt! ugh its aggrevating!!! Sorry had to vent! i think im just going to see what happens, no more pills or anything just kind of put a rest on trying and maybe it will happen...! Good luck everyone!