Help!! What are these symptoms??

I'm 4 days past my period, I have an ache in my lower back (like a deep ache usually when you have period cramps), bloating but more on my lower left front abdomen side, very mild stomach cramps.. 
I peed Last night before bed and about 10min later I had a slight burning sensation and a slight urge to pee again 🤔 I thought oh goodness not another UTI, so I drank a tall glass of water with a teaspoon of baking soda and I fell asleep. This morning I feel all these weird symptoms but none like the last time I had a UTI. 
I have no strange smell to my urine, no cloudy urine, and no urge to frequently pee and no more burning sensation. I've been drinking so much water, no caffeine, and plenty of garlic tea, plus I had a regular bowel movement this morning. What could this be? 
I have the iud, so I'm a little nervous if it's an ectopic pregnancy..? 
No blood in urine tho... Please help! 
My husband is picking up some AZO for me just in case it's a UTI

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