I had a UTI at 13 weeks, the only symptom I had was needing to wee more often and then not doing very much.
It didn't burn or anything though, and had no pain at any other times.
I cleared it without antibiotics though. Gave another sample at 16+6 which came back clear. Hoping they stay that way.
My advice would be to drink lots, as much water as you can, or diluted juice. Sugar feeds the infections, so avoid sugary drinks (including cranberry juice) but cranberry tablets can help keep everything healthy. I'm taking them most days now.