first of all, this is really personal. it is different to different people. some people can afford their own living without husband, some people can easily find another guy; these ppl tend to be easier to just break away from this kind of situation. what about if you care how people think about you being divorced? or if you care how people think about you having a husband who was playful (if not continue) and sleep around before?
i think you should consider for yourself first, disregard about being pregnant. If you don't have bb now, what would you have done? would you want to give him chance or not?
唔好因為BB而勉強,唔work嫁. 你好清楚已有刺, how to calm yourself down with hormones affecting your emotion during pregnancy?
of course, there are people who can really change, but you need to think through thoroughly very soon. when you have make up your mind, please don't look back and remember no regret.
honestly, after reading comments or advices from others, your heart should have already told you. you would have prefer and feel more comfort from some comments v.s. others. that's what your heart is telling you. no one can force you. listen to your heart. be strong. add oil.