How early is too early?

For baby to effect your urinating? I'm 15 weeks and I either have a uti, but there's no burning or itching or anything that indicates and infection. Or I need my urine protien levels checked again when I go on the 4th OR baby is doing whatever its doing to my bladder because everything starts normal and then I have to sit here and try to finish peeing and it's just a trickle with out pressure or anything and I can tell my bladder isn't fully empty.

And this just randomly started happening today(or yesterday? Within the last couple hours.)

Should I be concerned or is baby big enough to be causing peeing problems?

*on a side note hubby and I had sex the other night and I didn't pee after because I didn't need too. I did wipe off though. Maybe I have the beginning of a uti?*