Talk to Endocrinologist on Increased FSH

I am 26 years old, unmarried, weight 55 kgs height 5.4". I got my hormones test in June, LH, prolactin, TSH, CBC, VIT D all were within the range, only FSH was raised up to 10.88 on 2nd of menstruation. gynaecologist prescribed ovaflow twice daily for three months, I also cut down on junk, sugar, processed, oily food following proper diet suggested by nutritionist. mood swings got normal and also menstruation and cramps weren't severe in first two months. followed by third month had severe cramps. For many years I had suffer from severe cramps in first 2-3 days which get normal for some hours after taking mefnac DS. I repeated FSH test in September, now it was 15.1. Gynaecologist suggested ovaflow for some more time about which I was hesitant so she prescribed surbex z and ascard daily for two months. I am confused about what I should do now as some Dr say I should get the ultrasound to rule out PCOs.