My cycle starts on the 16th of every month and lasts 5 days if I had unprotected sex on the 13th,16th,22nd,27th.30th,and the 3rd could I be pregnant

Yes.
The release of the egg is not exact and sometimes it is early or late and sperm can live for five to seven days inside the vagina.
Anytime you have unprotected sex you are risking pregnancy.

Thank You