WTF - "Battery Acid Discharge?!"

Catherine
I apologise in advance if this is TMI but I'm so shocked I need to share and see if anyone else has either experienced this OR better knows why this has happened....
Today I wore a brand new, never before worn in perfect condition knickers. Have just gone to the bathroom for one of my million a day wee's a noticed that I now have a hole the size of a 5 pence piece in my knickers, which following some research online looks very probable to have been caused by my discharge ?!?!?! 
This is my first pregnancy and many of my friends have been pregnant and told me all the highs and lows of things that can happen etc... But not one has ever mentionedanything about their discharge turning into battery acid that eats through your underwear!!! 
Starting tomorrow I will wear panty liners but for tonight I'm just stunned! Lol