Oh yes, this is very common at 6 months, the thigh and between-the-legs pain is usually because your body is releasing relaxin hormone to loosen your ligaments and joints to prepare for birth, and combined with your growing belly shifting your centre of gravity, the pressure down there can really be quite intense. My friend who delivered last year said it helped her a lot to do gentle stretching, stay well hydrated, and make sure her diet had enough magnesium and calcium to reduce the cramping. Honestly though, I will not sugarcoat it, some days the relief is minimal no matter what you try, so do not feel discouraged if the stretching helps only a little. The good news is it usually eases up when you rest and prop your legs up, but if the pain feels sharp, one-sided, or is getting worse, please do flag it to your gynae or doctor to rule out anything else going on.