Pregnancy doubt. Pregnant or this is bc!

I have my last period on 29 of jan and and it's been three months i didn't get periods.. it's happening for the second time i had 3 months late periods 3 years ago also bcz am having PCOD i always have irregular periods but this time it doesn't come from 3 months.and about a month ago in march i was with partner we didn't have any penetration or sex we were just making out but i think he ejaculate near my vagina or maybe not am confused after that i wash my vagina and this happen when i am already one month late ..but am scared so i have take two pregnancy test in this month April just 2 weeks ago and they are negative and i have taken them in the difference of two days just to be sure ..but they were negative and i have taken them afternoon and evening So i consult a doctor a week ago and described her my problem she said it's not pregnancy and recommend me deviry tablet for 1 week today is my last day of tablet and am waiting please help me should i worry am i pregnant or this is bc