when my partner and started to try for our 2nd child i fell on during the 1st month, however i had a m/c at 7 weeks, it then took me 6 months to concieve again and we now have a great 2 year old!
i have been taking the pill since having him, however i wasnt on the ball a few months ago and although we only had sex twice in june :( i managed to fall pregnant again! so here i am expecting our 3rd,lol.
i guess your body will do what it wants, when it wants!