Pregnant??!!

I got my nexplanon taken out on January 8th and replaced it with Nuva ring sample due to insurance problems, (long story short my insurance wouldn’t cover my nexplanon replacement so the doc just took it out and gave me free samples till they could see me they still haven’t called me back.) My fiancé and I last had sex vaginally on New Year’s eve. Tomorrow will be (2? 3?) weeks exactly and I’m feeling nauseous but stopped my period immediately after putting in Nuva ring. We’re getting married in October and if we have a baby now it’ll be due in October!! Am I pregnant?? When should I be worried? When should I take a test? HELP!!!