i had unprotected sex with my boyfriend for around 20 seconds about a month and a half ago, 

he did not cum inside of me and I took plan b the next day,

i took 3 pregnancy tests a month later and got 3 negative results,

however, I have not had my usual period?

i got a period a week after taking plan b, which is expected, but haven't had my usual period since?

 

bearing in mind that the chances of pre cum getting someone pregnant are absolutely minuscule, and considering that I took plan b the next day (which would assumingly cancel out any chances of being pregnant anyway) as well as getting 3 negative results,

could I still be pregnant? 

 

Thanks so much, 

sarah.