 [ Symptoms ] having irregular periods trying for my first child been taking prenatal to help but nothing seems to help help  my husband and i are trying for out first child i stopped taking my birth control in march so i have been keeping track of my body to see different changes and my what is has been going on since i have been off my birth control is one month i will have period the next month i will not like for example july i had a period but august i did not i have been taking prenatal to help my body get use to them and help when i do become pregnant but i am just needing some help to help get pregnant thanks [ Disease ] hi i take it these irregular periods are in length if so i think your find that your ovulation day would still be the same in that case you need to be having unprotected sex on about day 10 day one being the first day of your period this way your husbands sperm will be in place and waiting for you egg in takes male sperm around 3 days to get to your womb and your egg should come out around day 14 what happens after that is implantation day and after that it would not matter how long your period was or short with this missed periods this could be a kick back from bc just how long was you on it it can take up to a year to get back into a regular pattern you find its not rely a good idea till this happens to start trying for a child hope this helps you good luck