Unless you are an expert on unprotected sex and the rhythm method count on being able to get pregnant anytime. Ovulation cycles have to be tracked carefully and vary by individual. And remember his sperm can stay active for up to five days in the female reproductive tract.
Yes you can but I would suggest waiting a few days to make sure everything is cleaned out. Also, ovulation cycles makes a big difference so I would suggest getting an ept ovulation test to find out what days you are ovulating most. But before you try to get pregnant please make sure you really are ready to be a parent.
YES, you can. You can get pregnant at any time during the month, any day, any night, period or not, ANYTIME. If you are going to engage in adult behavior, you need to be responsible as an adult. You need to get yourself on birth control pills and take them exactly as prescribed, every single day. You also need to use condoms to prevent transmission of STD's.