I have missed my period by 7 days. Also had unprotected sex the month before. Excuse me! But I keep farting BAD. Could this be a sign on pregnacy?

Take a test. Don’t guess. Take a test. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.