Feels like I'm getting a UTI at 4dpo...

Clare • Age 34, my husband and I have been TTC #1 since Jan 2014.
Hi, has anyone felt like they are getting a bladder infection then got a bfp?
​I have an achey sensation low down, feels like a chill, and I'm at the toilet a lot but no pain or anything during toilet. 
​Handed a urine sample in to my gp today so hopefully get results back soon. Just wondered if this has been similar for anyone. I've never had this before.  First month using preseed but that was about 5 days ago and I think if it was a reaction to that then surely this would've happened sooner than this. Hoping for a bfp! x