Could Cyst In Left Ovary Cause Constant Pelvic Pain Post Periods?

Hi, I am 25 year old women. I had started with constant pelvic pain about a week after my period so I called gyno. I went for a ultra sound and had a follow up a couple days later. My gyno said I had a 40% sized cyst left ovary, which she said is normal because I don t take birth control and the pain was not from that. She said to wait a month to see if it persists and they will go in through my belly button to see if there is anything like endometriosis. The pain is the same pain I have been getting during my periods for quiet awhile now. It is constant pain/pressure like a contraction when you are in labor it is in my pelvic and near my bottom get worse if I have to go the other bathroom. I had the constant pelvic pain for about 3 in half weeks and started my period which the pain stated to be on and off. About 1 in a half months later since I first started pelvic pain, it is not constant since my last period. It is off and on through the day, feel it after I eat, sometimes have a little sharp pain. I m not sure if this has to do with anything but my glands and a little down my neck hurt, occasional breast pains, and was having pain in my right armpit. Just looking to see if I should still have the procedure or what it could be? Thank you