Hi sexybori
This lump is obviously bothering you and causing you understandable stress. You will not stop worrying until you know for sure it is o.k. It may very well just be enlarged lymph nodes, but you will not know for sure until you go and get an ultrasound. Your OBGYN can refer you to an imaging center. If there is a problem, it is ALWAYS better to know sooner than later. If I would not have caught my early stage breast cancer & dealt with it, it could have been a lot worse.
But, my best advice is not to get too upset or worried before your tests. I have gotten myself extremely worked up over possible problems that turned out to be nothing. It's just a waste of energy. It's also a waste of energy wondering whether it is o.k. or not when you don't do the tests. So, request the test, keep your worry in check and move forward when you know more. My very best wishes to you & hope you have a good outcome:)