I can totally sympathise with u on this one as I suffered terribly from constipation during my first pregnancy. Don't ever feel anxious about pooping during labour, this will only make the problem worse and tbh the midwives are used to it and will clean it up without u noticing! Hope the lactulose helps, but please go back to the Dr if it doesnt cos there are plenty of other things u can try. Can't stress enough the importance of drinking plenty of water too! Xx