I have relation after 2 days of finish of period with my gf. should she get pregnant?

Pregnancy has been documented from unprotected exposure on any day of a woman's cycle including during menses. It is rare, but when it happens it is more likely among the irregular. Your cycle may be a estrogen breakdown cycle after a missed ovulation (makes you irregular). You could then ovulate and be ready to conceive at any point.

Pregnancy is known to have occurred from sex on any and all days of the menstrual cycle, including when the woman was bleeding. If you do not want pregnancy, use contraception all the time, every time. Get HPV vaccine.