If i had my period for a day on sunday and stopped on monday and i had sex then and then came back wednesday can i get pregnant?

Yes: If you are not using a reliable method of contraception you can get pregnant.

Yes...: There are "no safe days" is because there is always a chance of random ovulation. In a normal cycle, the expected ovulation is roughly two weeks after the beginning of your period; however, if you have a shorter cycle, then ovulation would be closer to your period. If you aren't trying to become pregnant, speak to your gyn about birth control options. A condom should be used to prevent STDs