9 days late, negative test

Okay so my last cycle was a little strange, started, stopped & then started again.

Totally not a big deal, it happens 🤷🏼‍♀️

But now I’m 9 days late & my cycles are always on time.

My partner & I weren’t trying, but we weren’t preventing either as we have a 7 month old who took 3 years to conceive.

All pregnancy tests are negative though, I’ve taken 3. The most recent yesterday.

Any clue on what’s going on?

I don’t feel like I’m getting my period, I don’t really feel pregnant either though, maybe a little nauseous, but that could be in my head 🤷🏼‍♀️