Regardless it's still his child whether it's from you or another woman. My husband had a child previous to our marriage and two with me and he loves every single one of his kids the same. If he's a good father to his first he will be to this one....dnt worry
Unfortunately a lot of people have favorites. So he may very well treat them differently. Though keep in mind every child is different and love is different for every child. I would talk to him to make sure he is aware of how you are feeling. You don't need stress or jealousy that would just cause more issues in the future.
My first born father plays favoritism ALOT! He treats his last child better than the rest. He has 5 && he treats them all different instead of equal. He just hasn't grown up all the way && he's 27!
But as long as you give your child unconditional love that's all that matter. Because your child is gonna grow up && notice the lack of love & affection coming from his end. So don't worry yourself over his love if he is a real man he will love them unconditional
I would think it would be hard to love all children in the same way. They are all so very diff. I have 4 step brothers all completely different. My GMA had 4 kids all different. And my sister and I are not alike at all. I notice we get treated very differently... Like the way love is shown, however I know they love us both! But never be afraid to say something to him, just give him the opportunity and see how he does.