I need opinions please help

So my period is2 weeks late but my fiancé and I didn't have sex until 3 days before my period was do and it was the first time in 2 months we had sex and I talked to him about it and he says I'm just stressing about my period which is causing it not to come but idk I've been having really bad heart burn and massive mood swings, can someone please let me know what you think about it?