Back pain in lower right side?

I'm 19 weeks and I woke up with dark urine and feeling very sore in my pelvic area. Now I'm getting dull throbbing in my lower right back. Should I be worried?

UPDATE- they told me I have a muscle strain. No uti or infection anywhere. No signs of dehydration. They sent me home with a few heating packs and told me to take it easy.