No period

I'm 19 years old and I've always had a regular period. However, ever since my boyfriend and I started having sex about a month ago, I have not gotten my period. He always wears a condom when we do it, but I am now 11 days late and I've taken two pregnancy tests and they both came out negative. Does anyone know why I still have not gotten it?
Any advice is appreciated!

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors