Obviously I would never do that intentionally, however...
Im 7 months pregnant and was out shopping on Saturday, and I had been the loo before I left, and when I arrived at the shopping centre.
I was in Superdrug and I literally just had to go, so I politely asked the security guard and explained I'm pregnant (even though it's very obvious) and she outright said no. That there are toilets in Asda, which is at least a 5 minute walk (10 minute waddle) away.
Let's just say it didn't end too great for me and I was mortified
Surely there's some sort of law for pregnant women to use staff toilets when shopping?