What are my chances of being pregnant?

Hello everyone! My boyfriend and I have been having unprotected sex a lot not planning to get pregnant. We had sex the day my period ended with no condom then about a week later we had sex again without a condom. I am not on any form of birth control. I know that after we had sex the day after my period I ovulated about 4 days after. I have what I think is the common PMS symptoms tender breasts, fatigue, excess hunger, and slight cramps that only last for an hour or so. What are my chances of being pregnant? I don't know if I am having symptoms or if it is just my period coming. Someone please help me I am very confused!