Just go get it checked out just to be sure. If it was your water that broke you have 24 hours to deliver or else it can cause an infection. So i so better safe then sorry.
I didnt get a positive result until i was 7 weeks. And i think that animals can sense those types of things. Like before i found out my dog would follow me around everywhere and would just want to be by my side 24/7 and she was never like that before. So im sure she knew before i did. Just wait...