weird situation? pregnant?

So before I start I've taken about 4 different brand pregnancy tests and all negative.. I have a doctors apt for Thursday but anyways... 
I have an almost 1.5 year old baby. 
I have been feeling what feels like kicks. And my stomach has been hurting when I wake up and sometimes my back hurts(though could be the way I sleep on it) 
I'm asking if I have a negative test result could I still be pregnant? Has anyone experienced this? 

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