I finally became pregnant... and now I’m confused

After a year of stress and trying, I finally became pregnant. I broke the new to my boyfriend yesterday, he was shocked and nervous... he said that he was scared but that everything was fine and we would be ok. You see we both have teenage kids from a previous relationship.

Today when I left the doctors office to get the seal of approval... my boyfriend started acting strange. He saw me all day not saying anything and later this evening he calls me on the phone saying he doesn’t want a baby. He doesn’t want to start all over and then starts to put it on me that I’m the one that wanted a baby and he never did. We argued for a while and I asked him what did he want... his words exactly were “ I just want it to be us”... I really don’t know how to feel about that... pretty much he’s asking me to abort my pregnancy. I told him I didn’t want to and if I did, we would not stay together... I don’t know how to feel... I was super excited and overjoyed, now I’m depressed and don’t know how to feel.... what do I do? HELP