Me and my bf had sex on the 19th october but protected hr even checked after. Of course I started to get paranoid right after I guess first time jitters, so I waited to get my period on Nov 1st but instead I got it 4 days earlier spotting first and then going into my regular period. It lasted 5 days which is normal but right after it ended I got nausea and gas and it hasn't ended yet. Today is the 8 of November. I took a test yesterday and it came out negative. So what's wrong ?!