Oh yes, I totally understand how unsettling that tingling feeling can be, I had the exact same thing on my upper thigh during my second trimester and was quite worried about it! My gynae explained that it's actually quite common and usually caused by nerve compression, where the growing uterus or even just your posture puts pressure on the nerves running through that area, leading to that numbness or tingling or even a slight burning feeling. Someone in my mum group mentioned that the sensation tends to flare up more at night or during stretches because certain positions can increase that nerve pressure, which is probably why your yoga sessions are triggering it. The good news is it often eases up once your body adjusts or after delivery, but do pay attention if it gets more intense or spreads, as that would be worth flagging sooner rather than later. Hope you find some relief soon, you're definitely not alone in this, and it's really good that you're paying attention to your body. That said, since everyone's situation is a little different, it's always worth having a quick chat with your gynae or a doctor just to rule out anything else and get advice tailored to you. Take care of yourself, mummy!