Am i pregnant?!

So I’m 17, I had protected (condom) sex on the 7th and my period regularly starts on the 8th-12th. It’s now been an entire month without a period. I know I stressed enough to mess with my period, but an entire month missed? I’ve taken 2 pregnancy tests both came back negative. I have a doctors appointment in January but I’m still worried. Can you stress so much you skip a period? I’m sorry if that’s a dumb question. Or are there other health issues that can cause that?

(UPDATE) got my period on the 5th of January. I’ve never been so happy to be in pain for the next week 😂 I definitely just stressed myself out with my overthinking