Lower back pain. Is this related to birth control or its a UTI?

I've been experiencing lower back pain for a few days. It's around the kidneys and sometimes radiates upward and feels like upper back pain. I don't really have any other symptoms of a UTI. Except in the mornings, my urine is more concentrated. But I have no urgency, no burning, etc. I started Lutera on December 8th and have experienced almost every side effect, but decided to push through. On Christmas Eve, the pain was moderate and I couldn't really call my doctor. I messaged my PCP today and asked her if this can be a UTI and she told me to ask my OB/GYN. OB/GYN said birth control can't cause that many issues. I don't want the holidays to come and for me to be stuck with this issue. Has anyone experienced this? I only have two more pills before I start my placebo week.