O... I have had much discussion of my lady bits on this site! And thx gawd so for these wonderful understanding female souls... sometimes the boys in the bike shop are not so easy to talk to.

I had this issue for the road bike. Lots of discussion on fit, saddles, etc. As already posted spinning is the same on bike fit in theory... weight on sitz bones, not lady bits. Hopefully you have a good teacher, they should be able to reasses your bike fit.

Perhaps if you have lost alot of weight (Kudos btw, been there, done that too, feels awesome) that could affect your posture.

One other thing that never occured to me to evaluate (until I read it on this site) was gyno related issues. Sometimes as our hormones change post kids, and age, our vaginal tissue thickness, and moisture levels change. Thus all plays into saddle comfort.

So, prior all fit well etc... if the parts themselves are changing, then that could be the culprit. Lots of great info on that in threads here. Just a consideration if a trip to the gyo is anywhere near due.