Hi there and welcome. Well, sometimes it takes a bit of time for a cycle to become regular after being on the pill a while. it's hard to immediately predict ovulation. So, begin tracking your cycle and when you feel you've had a normal couple of cycles, it is good to start trying. Day one of your period is the first day of your cycle and then you begin having sex on cycle day 10 every other day for the next 10 days. good luck and hope you are pregnant soon. :>)