So i got semen in my vagina 3 days before ovulation. i think i am pregnant. im waiting to see if my period going to come on?

A simple urine pregnancy test done on a first morning urine should be positive in pregnancy 2-3 weeks after exposure. They can be falsely negative early in pregnancy, but by the time menses is missed, they would usually be positive.

Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.