Hi,
The first day of my last periods was on the 13 November.
Forcibly my husband participated in unprotected sex on 17 November .
I want to know the chances of pregnancy ?
Because we don't want children now. We have commitments for next 3 years.

Please give suggestions to avoid pragnency.

Forcibly? You were raped by your husband? Your chances are 50/50 because you had sex. You will need to wait to see if your next period comes. If not, wait until you are two weeks late and test using first morning urine.

"Please give suggestions to avoid pragnency." You are married and don't know how a baby is conceived? Visit a local family planning clinic. Are you in the US? Planned Parenthood.