lower ab discomfort

For the last week I have been experiencing a dull ache in my lower abs when running. I ran 16 miles today as part of my marathon training and felt discomfort at 9 miles, so much so that I stopped to pee as I felt the need. This in itself is weird as I never feel like this. It's odd as I have no symptoms of a UTI or anything but still have discomfort (ache) now. 
Has anyone had anything similar? Will try and get a doctors appt this week to rule out a UTI but am worried as i've run for years and have run this level of distance many times so i like to think i know my body's reaction! 
Any advice much appreciated
Laura
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