I Am 33, My Husband And I Are Tying To

I am 33, my husband and I are tying to have a baby. I have been checking my cervic fluid and noticed a round lump about the size of a quarter. Its on my back vigina wall and when I pushed on it i felt the pressure on my anus as if I had to make a bowl movement. Help! I am worried or is it just apart of the woman vigina?