Disrespecting me?

So I feel the need to vent a little here. I am currently 27w pregnant with my SO's baby. I went to the ER recently because I am having issues breathing though my blood came back high that I have a blood clot they couldn't figure what was wrong. And my SO hasn't even asked me how I'm doing or even asked to visit me. I thought okay whatever at first maybe he's just busy. Now he texts me that he's not gonna text me for a while because he will be at a friends. I asked him why he couldn't just text me there. Then he says he's gonna smoke bud. First: I thought this was weird because it wasn't a friend I knew. second: he never smokes weed. This made me very upset because we had agreed before that we don't like drugs and wouldn't use them. I've stayed away from that lifestyle. Though he used to smoke a lot before we dated once we got together he stopped. He said he needed it to relax that he's stressed out... Yet I don't get why he can't even tell me what's bothering him. He barely tells me why he's stressed or when he's stressed out. I'm always willing to hear him out and talk to him about anything. Now he just takes it out on me. He knows smoking would hurt me... It feels really disrecpectful. He understood how I feel about it. Should I have the right to be upset or am I over reacting because it's his choice?