3 days overdue

Hi again...
I’ve got another question.
Normally I should have gotten my period this Sunday, but it wasn’t like that before. I tested back then because it was carnival and I wanted to know if I could drink or not, and it was negative.
Now I still haven’t had my period. Since last night, I’ve been feeling this weird sensation in my stomach. It’s exactly like muscle soreness, as if I’d done 50 push-ups.
I’m also smelling everything way better. My dog had an accident inside yesterday while I was lying on the couch, about 7 meters behind me, and I could smell it... I just went to the bathroom and now I’ve put on a panty liner because you never know when they might start, right? And the discharge was kind of dark yellow, very light brownish. But not when wiping (sorry for the description).
Could it still be possible??

Best,