Really upset today

Hi, I can't tell if it's my emotions or if it's things at work making me miserable. My manager is terrible, she tells me I look 'dreadful' when I don't put any makeup on (I'm 13 weeks, she knows I'm expecting). She's ignored me a few times and responded to my emails in a very rude manner. She's developing someone who is my junior, but by 'developing' I mean going behind my back and taking my responsibilities away from me and giving them to my junior. This always happens when I'm out of the office and never part of any discussion. Today, they went on an important seminar but they didn't tell me about it. It was very important to my job role. I feel like I'm being sidelined and today I just cried at work. I feel totally sad and I hate that I feel this way.