Re: need advice very worried please help
Alright, let me explain something very quickly.
The second half of your menstrural cycle (the half right after you ovulate through when your period comes) is set in stone. The moment you ovulate, your body knows when your period is coming. This is why the theory "Stress delays periods" is incorrect. Stress can delay or stop ovulating (which leads to a delay in a period) but your period is gonna come when it wants to, regardless of what you do.
Anyway, in order to get pregnant, a woman has to have sex within a 24-72 hour window. And 72 hours is a very generous time...so most likely 24-48.
For you to have ovulated (in order to get pregnant when you had sex) and then be due for your period two days later is next to impossible. That would mean your cycle was probably about 11 days long.
If your cycle is pretty consistent, and you are pretty sure that you were due for a period two days after your sexual encounter, then there's next to NO way possible to get pregnant.
This is just my personal opinion. I agree that if you want to test...it's too soon.