TTC but something isn't right! I need help

Zukeeya
Me and my husband been TTC for 5mths now. The past 2mths, my cycles appeared 5days early from estimated start date. This month, my cycle is 3days late😞. I took 3 test, all came back negative. I took it upon myself to go to a Dr to check which they gave me another urine test and it came back negative but showed I had a minor UTI. With my first child, I had a UTI as well as well as the Test kept showing negative. They did an ultrasound and saw that i was indeed 5wks pregnant with my son. So my question is, IS IT A STRONG POSSIBILITY THAT I MAY BE PREGNANT OR THE UTI IS THE CAUSE OF ALL THE SYMPTOMS OF NAUSEA, TENDER BREAST, STRONG SENSE OF SMELL AND LATE CYCLE?