Based on your previous post(s), I think you already know the answer. You are clearly conflicted by the fact that you KNOW he doesn't want anymore children...now you add on that he's said he doesn't KNOW if YOU are the right one.
I am going to be a little mean and say that if you are sexually active then it should never be a HUGE surprise to find yourself pregnant. I am not saying that from a moral point of view (afterall, I got knocked up while separated and in marriage counseling with my now ex-husband). Just that you should be realistic about the actual effectiveness of birth control even when used EXACTLY right...or even if you're using multiple forms..lol.
If you stay together, and continue to have sex (which is part of the deal, right) this won't be the last time you face this question. Should you find yourself pregnant, and he is still of the same mindset, he WILL blame you and think you did it on purpose.
Through my own experiences, I believe that if you can't have some idea of your suitability for each other after a year then MORE time isn't going to help. Of course, it could all depend on how long he waited to date after divorcing. Even the best of divorces are messy...but people go on to have healthy relationships (though at a statistically lower rate).
Good luck with this. I know how hard it is to "cut bait" and move on after having invested a year of your life. As women, we try so hard over and over again to make things work. We blame ourselves for things we have for which we have no influence. You are better off moving on before YOU get more damaged by this relationship.
P.S. I agree with the next poster, you should definitely see the doctor especially if you are actually expressing milk versus having a milk'like discharge. I weaned my daughter nearly two years a go and still have some milky discharge during some times of the month.