Contraceptive jag. Want another baby.

I have a daughter at 1 year old, me and my partner want to try again for another baby, I've been on the contraceptive jag, I didn't go to my jag appointment which was the 28/3/13. That was when I was due my jag again, is there a certain period of time before you can conceive again or can it happen as soon as possible ?

Thanks.