Feels like a ballon coming out my vagina ๐Ÿ˜‚

So I'm 36 weeks and past few weeks every time (I assume) when baby pushes down, it feels like a ballon coming out my vagina.
Asked my mum lol she said "it could be bulging waters just from pressure of baby pressing down"
So if that is right.. could that mean it partially dilated? Got midwife tomorrow so will be telling them about this sensation ๐Ÿ˜‚