STI risk

I'm sorry that you're having to go through this. Looking at the timing here, and what you're describing, it does sound like you had your menstrual period, in which case no, you cannot be pregnant. Not knowing the length of your cycles, or the date of that last period, I can't tell you when to expect...

This is called condom failure. You treat the situation as if you did not use a condom. You cannot rely on the condom to protect you against pregnancy or infections. First, you retrieve and properly dispose of the slipped condom. Sometimes, if the condom slips off, it gets stuck in the vagina or...