Lump under perenium

i delivered my son vaginally 9 months ago and had a little bit of tearing (required 5 stitches). I was wiping a couple days ago and noticed that there was a little bulge at the bottom opening of my vagina. I didn’t think much of it and then today when I wiped again I felt it. It’s def under the skin and is about the size of a blueberry feels rubbery and moves under the skin freely. You can’t see anything from the outside but I can feel it. It’s at the bottom of the opening in the perenium area towards my bum. I booked in to see the gp next week but didn’t know if anyone else had ever had anything similar post partum. Also this may be a normal anatomy thing as well and I only noticed it after trying to insert my diva cup and kind of digging around.