stress will keep her from having her period, as well as if she has it in her head that she is pregnant her body will trick her. so just relax and tell her to keep her mind off of it and see how that goes. also, menstrual cycle's aren't always on the same date, sometimes you miss a month and sometimes its 10 days late, depends on what you are telling yourself. there is a chance that she is pregnant but by what you said its most likely the stress.
from what I have been told on this site precum itself doesn't contain any sperm but there can be left over sperm in your penis from recent ejaculation. I could be wrong though.
She can test 19 days after intercourse and get an accurate result.
you can get pregnant from precum.
True, but i read that precum does not contain sperm. Is this true? And even after i cleared my urethra by urinating a bit more than 6 times?
oh it is always likely, but stress can hold up her period. time will tell keep it in your pants dude.