Weird start to pregnancies??

Tasha
Okay so I have some weird symptoms going on here- tell me if I'm crazy or if it's a possibility for a BFP
​What I thought was my period, started three days early and only lasted about 3 days. Around that time I felt nauseous for 3-4 days. Didn't really feel anything else. It's now about 10 days later, was fine all weekend and it just hit me. I feel extremely bloated and can't "suck" in, body exhaustion, back pain, and my boobs look like they're popping out of my shirt! 
​I feel like I had a uti last week and took some tests and all were negative.  
​Am I crazy? 
​Has anyone ever not had a BFP show up until later in their pregnancy