Hello, Unprotected sex just after or before period is very much safe and chance of pregnancy is rare if previous cycle was regular. Bad odor vaginal discharge may be due to bacterial infection or contacts with chemical substance. However, after ovulation women usually get white discharge due to effect of progesterone hormone. It is quite natural and odorless. Just maintain your genital hygiene. Here, you can undergo one blood test for beta-hCG to exclude pregnancy. Try to avoid mental stress and practice safe sex in future. Good luck.