Uterus size and paraovarian cyst query.

I have been undergoing ultrasounds for the past few months to monitor a paraovarian cyst. I had my first scan on April 13 , second on on June 7 and most recent one on 19 July. In all of them, the paraovarian cyst (in left adnexa, adjacent to left ovary) has not shown significant change in size (4.8x4.4x4.1cm, 46 cc volume). It only causes slight pressure and minor cramping pains sometimes. Does this warrant surgical removal? Another question I have is that in my scans, I have also noticed changes in my uterus sizes. The April 13 scan (19th day of cycle) size was 6.5x2.8cm, ET 5.4mm The June 7 scan (35th day of cycle) size was 7.1x3.1cm, ET 8mm The July 19 scan (5th day cycle, my period was still ongoing) uterus size was 5.8x2.2cm, ET 3.7mm I understand that endometrium undergoes change throughout a menstrual cycle, but is this variation normal in uterus size too? This was through external pelvic ultrasound so is this variation range expected?