Hi I Am 36year Old Female. I Am About 5

Hi I am 36year old female. I am about 5 weeks pregnant. I have the urge to pee a lot in the last week. With an uncomfortable sensation at the end of going wee's. As well as sometimes not peeing much when I go. Help please Im over it. How long will it last?. Also could it be to do with my Liver as in February this year 2015 I have a virus in my liver.
Thanks Nicky