Um....idk what’s going on

Ok so I’m 17 and a couple weeks ago(March 2nd) I had sex(for the first time) with my boyfriend. my period was supposed to be here on the 9th...between the 2nd and the 9th, we’ve had sex 4x...it’s the 14th and my period still isn’t here...but I know can’t be pregnant cuz he used a condom everytime and I know it stayed on the whole time...but like now I’m scared cuz my period is NEVER late. And I don’t know if this is related in any way but,

I’ve been completely exhausted for the past 3 days, I don’t have much of an appetite (all I’ve been eating is toast and cereal) but I’m usually pretty energetic and I’m usually ALWAYS hungry and ALWAYS eating...

UPDATE!: ok so I think everything’s good😌 my period finally came😁💕(that’s something I don’t always say)