Re: Don't know what is is! uti?
How pg are you?
Be sure you drink lots of water in case "concentrated" is moving toward "infection" and if you continue to be uncomfortable, see your doctor again for another urine check. You don't need a UTI (that ususally stings when you pee) as that can trigger labor to start, but a yeast infection can itch until you're crazy (usually have a think white discharge with this). If you start running a fever, call the doctor.
I doubt if your sleeping position is pinching or cutting off the circulation, but the pillow between your legs would relieve that.
A friend of mine got a varicose vein in her labia and that was so awful and annoying. That's possible, but with your recent antibiotic use, I'd bet yeast.
Wishing you well! Barbara