I have the right to be mad

My boyfriend left early this morning said he had stuff to do knowing damn well I wasn't feeling good I've been cramping all day 17+1weeks pregnant I think I'm getting a uti.I'm dealing with our 2 kids that well haven't been on their best behavior today it's close to 7 and I called my bf to ask him around what time he would be home our son( 17 months) is out of milk ( he doesn't drink regular milk he has stomach issues) well he knew that since yesterday that he was running out and didn't even bother to get any ...well he is in a whole different state 2 1/2 hours from here he had said it like it was no big deal I'm frustrated because we only have one car and the store is not close at all I'm just done he really needs to grow up apparently he wants to be care free I told him not to bother coming home tonight sounded harsh but I have the right to be mad