Reasons my period is late?

Zas

So I’m 3-4 days late and I’m getting all my period symptoms: cravings, mood swings, acne, and cramps that I get before my period, but they’re not that bad this time. Last time I had sex we wore a condom and he didn’t even finish inside me anyway. And his pre-cum well... we for sure know the condom wasn’t broken.. what could be wrong?