Hey honey, sounds like it'd be a good idea to go and chat through things with someone non-judgmental You could try here for some advice, they have a helpline and centres too...
http://www.careconfidential.com/
It may be an idea to get away from things for a few days on your own or with someone supportive and non-judgmental where you can think and go through your options and decide what's best for you regardless of anyone else.
HIS marriage has nothing to do with your pregnancy, it is for him to worry about, not you.
If you needed to you could move away and have a fresh start with or without the baby.
i wish you well in whatever you choose to do xxx