am i pregnancy

keep in mind that there is always a time when pregnancy can occur if you are not protected. The safest time to have sex is during your period because this is when you are not fertile. Seven days before your period is after ovulation, so this is a safe time to have sex. The estrogen and progesterone levels drop and the lining of the uterus gets ready to be shed. Your next period begins and your cycle will repeat again.

hello, i am 23 and i have a 2 yr old son . i know in order for me not to have anymore kids i need to use protection , but sometime moments happen and i dont think about the consequences. well i had my period on the 18th august i got off on the 23rd , the next day i had unprotected sex, but i took the PLAN B within the time frame, but i never got my expected perio which was supposed to hit on monday the 15th of sept. i took a pregnancy test last night , the results were negative, so can anyone tell me that there can be faulse negatives or is it stress?