im worried.My boyfriend and i had sex like a month ago the day right after my period was gone...we used a condom with spermicidal and after we were done he took off the condom and everything and we were just laying down on the bed for like 20 min. after that he putted his penis inside again with no condom and it was for less than 30 seconds...he didnt cum or anything..but now im late,ive been sick with the flu and very stressed out and paranoid about a pregnancy ever since that happened,also taking into consideration that my period has never been like clock work..is kind of irregular and i finished a treatment like 4 months ago cause i had Polycystic Ovary Syndrome (PCOS) i used to misss periods before the treatment cause of that but i didnt after being on the treatment,so i dont know what to think.Also ive been feeling funny at times,like im gunna get my period,but i dont get it...Any help? what should i do?