Twins help pls

Hi I'm pregrant with twins found out very happy to say the least! Never thought it'll happen to me! I don't seem to have a lot of CM is this normal? And little bloody pink discharge is this normal? Does the heartbeats start at 6 weeks to be seen? I went last week and only saw one I was u der 6 weeks have to go back but of course I'm worrying, and is it normal

To have one baby little smaller at this stage? Thanku nervous Mum