What could it be?

I'm having pains in my lower abdomen, both sides are giving me werid pulling, pinching sensation randomly through the day, on top of that my uterus feels sore & the pressure can be intense at times in there, I feels like someone has repeatedly kicked or punched me in the uterus. I notice around the time I pee, or need to pee the pain returns or gets worse, calming down after I emptied my bladder, but that's not always the case. Most of the time it just does it., Any ideas? I will be contacting my doctor tommrow, is just like to have an idea of what this "could" be.

Nikki Hicks
    UTI or PMS.

    Part of my lovely PMS issues is major uterine pain. I had the doctor check it out and nothing was amiss.
    About Nikki Hicks
    Birth: November 25
    On Moms.com since: Nov 29, 2013
    Hello, the name is Mara, but i go by Nikki, I'm a 25 year old SAHM, Married to my high school sweetheart, we've been blessed with 3 beautiful kids, Chloe(6) Michael(4) Myles(2).