I've already answered this question. Take a pregnancy test when your period is due/late. It may end up being late purely due to coming off birth control.

ahhhh i didnt realise you were on the pill.The pill interferes with your cycle and in my opinion it can interfere with pregnancy tests too (although im sure most wont agree with that it has been my personal experience)You were regular whilst on the pill because the pill makes you regular.The pill can also change your cycles all together my cycle became longer when i got off it but also you are more fertile when you first get off the pill i was pregnant within days of getting off it.but the tests were coming up negative until 8 weeks after and by then i'd had a missed miscariage with out realising i was even pregnant because of the false negative tests i hope you are pregnant good luck and keep hoping.p.s it is very possible your just having longer cycles now but keep testing until you have a period its the best way. there are some cheap tests you can buy now and then if you get a positive you can do a more expensive one good luck