Since you have not taken the pill regularly, the chances of pregnancy
is remain, however there are reports of it being minimal chance.
Remember a woman can be fertile from day 10 her cycle upto day 19 of menstrual cycle( if menstrual cycle of 28 days).
Please take a urine pregnancy test if you miss your periods to see if you are pregnant.
Its a simple test with a pregnancy kit which can be bought in a near by pharmacy and done at home.
I advice you for next time Kindly use other forms of contraception
if you not able to take the Oral contraceptive pills
1. Copper T
4. Colitus interruptus ( least efficienct method, here the penis is withdrawn before ejaculation)
5. emergency contraceptive pill
I hope I have answered your query,
Dr Rajesh Sarkar