Hey
Welcome to the wonderful world of TTC
how long are your cycles normally? if its the first month off the pill you could Ovulate anytime in the month so best to BD every other day or more if you want to....
the first few months it might be worth noting some stuff down about how you feel and any cramping or anything as it helps each month to know if you've had those symptoms before and stil got your period turn up at the end of the month as a lot of preg symptoms are the same as AF (period) symptoms
Hope thats helps a bit
