O.K Girls, I'm so confused...

I'm just over 32 weeks pregnant with twins and have been experiencing Braxton Hicks for what seems like forever - since about 21-22 weeks, however over the weekend they seem to be coming more frequently. Some are just the tightening, others are stronger where it seems like they are also constriciting my lungs making me breathless and I have even had some that are uncomfortable enough that they have woken me from a nap or sleep.

Yesterday I timed some of them and I was getting between 6-7 per hour lasting about 2 1/2 minutes every 7-10 minutes apart. I have been told that twin a is already starting to engage but so far have not had a "show" at all. I know I should expect them to get more frequent as my belly keeps growing as I'm now measuring bigger than a singleton pregnancy but am I getting too many.

I start CTG monitoring at my hospital starting on Friday but want to know that I'm not going crazy.