couldn't read and not post, just try and stay positive, being PG and not knowing what to expect is a strain on any relationship.
In regards to the sex restrictions your DP needs to realise it's not easy for you either, when i was PG with DD1 i had quite a few bleeds and DP was not allowed near me, i couldn't bear the thought of it... your DP should not be threatening you with going to sleep with his ex's.

Please take it easy, maybe a good chat is in order regarding what you both expect at the moment!
Couldnt have said it any better! Hugs hun!