Feeling baby movements,but not pregnant???😰

Okay so I have all the pregnancy symptoms aside from vomiting. Lower abdomen pain,lower back pain,fatigue,headaches you name it! I took two pregnancy test at home NEGATIVE. I went to doctor they did one NEGATIVE. I am due for an ultrasound on 25th. I mean i can't be pregnant I still have my period!!!! Mind you we had unprotected sex on "safe" days in July. August and Sep period normal heavy.