Delay in periods after unprotected sex.

Very good evening Mam / sir My height is 5'4 and weight is 66 I was previously diagnosed with multiple cysts in my both ovaries with multiple follicle formation And also with high level of tsh and markly high prolactin without  galactorrhea I was prescribed with prolactin medicne for 5 weeks and after medicine it come very low I was not prescribed of any thyroid medicine I had completed my prolactin medicine course in october And had  my periods normally for 2 months But from last to months my periods are earlier than my normal date In december - on 6 th In january -on 4 th In feburary - on 2nd Then again on 25 feburary Sir / maam I had an unprotected sex on 14-15-16 march And today is 29 march and i am not having my periods till now Is there any chance of pregnancy in my case Please guide me Really hoping on you