Hello.
I am on the mini pill and missed one last week, I had unprotected sex with my partner the day after. I now feel bloated and have mild cramping in my stomach( like period pains). What are the chances that I could be pregnant?

Pregnancy is always a possibility. There is no form of birth control that is 100% effective. Since you missed a pill you are at increased odds of being pregnant. However, it is impossible to give you a percentage of whether you are pregnant. You are now playing the waiting game.