experiencing severe pressure in my vagina on Lutera

Ive been on Lutera for 2 years now and have noticed ever since I started taking it Ive been experiencing severe pressure in my vagina it feels like somthing is pulsating or throbbing and its very uncomfortable. This occurs around 2 times per every 4 months and it has been getting noticeably worse in the last couple months. I went to see my gynecologist about this and she said she had never heard of this before and said unfortunately for me she cant think of anything that could be causing these symptoms. She said to keep a diary of when it happens and the dates and so forth to try and link it to somthing but so far I cant all I know is that it started happening when I begun taking Lutera. Im going to make another Doctors appoitment with a different Doctor to get a second opinion. Hopefully She will be able to help but im not sure, I would really like to know if there are any other cases like mine and I would Definitly appreciate some/ any medical advice.