Derby ghost walk!What to expect?

Posing this here as no idea where else to post it and obviously it could apply to anyone!So...Has anyone ever been on the ghost walk in Derby,Derbyshire at the Derby gaol?I really want to go but very scared lol,If you have what should I expect?Is it scary?And what do I get for the price?Also by the time I went I'd 19 weeks pregnant,would it not be a good idea to go?Or wouldn't it matter?