First off, I am so proud of you for being calm. Isn't it amazing what we learn from DBing! Now, I am going to go opposite of what a lot of people are telling you. Let me start by saying the DB principles are wonderful and can help someone save their marriage. But if we are being completely honest about it, they are mostly to save ourselves. I don't know the numbers invloved of how many marriages are saved and won't try to guess. I can say I have been on this board for over 2 years and have seen very few. YOU are the only person who knows when it is time to give up. I have read everything you have wrote on these boards. To me, an outsider, I came to the conclusion long ago that your H is a sex addict or serial cheater. This won't change until he wants it to and figures out what causes it. I doubt this can be fixed in a matter of months...My bet is it will take years, and him hitting rock bottom to want to change. He may change, FOR A SHORT PERIOD, if you tell him you're done. But just understand the compulsion he has for sex with other women will still be there without the tools to learn how to deal with it.
I do agree that you should take your time about filing. But do not wait to see a lawyer. You need to make sure you protect yourself AND your kids. If your financial situation together is getting thin, get a lawyer involved. The longer you wait, the worse that part can get. I also know that being pregnant, your hormones are through the roof. It might be easy to get swayed again.
You deserve to be happy. You have learned a lot going through this process to know how to make yourself happy and stay that way. We can't depend on other people to make us happy, on compliment our happiness. You have done some serious growing from when you first came here. I have no doubts, you are going to be fine! You will be on my prayer list until I no longer see you posting (well, maybe a week longer)!