Hi,
I would get yourself to the doctors. If left untreated it could develop into a full blown kidney infection.
They will give you anti biotics to clear it up.
It's common in pregnancy they say.
I had a UTI last month, it was really nasty. I tried flushing it out with cranberry and water but with hindsight I realise now that it's best to go straight to the docs. Especially as you're pregnant.