Haven't had my period in 4 months?

I haven't came in my period in 4 months, and the last time I had sex was 8/9 months ago even though I've taken a pregnancy test after that and they all came back negative? Anybody know what's up??? 

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