Probability of pregnancy

[The anonym]

Not protected sex for the second and third day of the termination or ending of a menses, whether probably to become pregnant during this period?

[Medtsentr]

Hello, pregnancy can come or step, if not protected sexual certificate or act has occured or happened for 10-17 day of a cycle, how much spermatozoons can save ability to a fertilization, being in a vagina within 4-5 days.