Low back pain low ab pain on left side and center bloated feeling and stomachache am currently halfway through cycle so it's not pms.

Mittelschmerz: Mittelschmerz is one sided lower abdominal Pain associated with ovulation . It is German for "middle pain" since it occurs midway through the menstrual cycle . The only curveball is that you also indicate you were having back pain. This is something you can discuss with your physician to clarify the diagnosis.

See MD : You need a full history and physical exam. Left lower quadrant abdominal pain that radiates to the back could be a ruptured ovarian cyst. It could also be intraabdominal pathology such as diverticulitis or constipation, or if associated with flank pain a kidney stone or even a problem with the abdominal aorta. Full history physical meds and review of symptoms needed. Stay calm and see MD.