Aiyoh, that's uncomfortable lah! A few of us pregnant mums actually dealt with this, it's the extra swelling and friction down there, kan. I swear by wearing cotton underwear that's looser fit, and applying body lotion or even coconut oil to the inner thighs a few times a day to reduce friction. Some of my mum friends also suggested wearing longer loose dresses or maternity leggings instead of tight pants to minimize rubbing, and if it gets really raw, a barrier cream or even diaper rash cream can help protect the skin.