Discrimination at work or overly sensitive?

Jennifer • Military wife🇺🇸 currently pregnant with a little boy💙 due in December🎄
I've been working at a high end restaurant for over a year and a half now as a host. We are approaching summer which is our busy season so we have several job openings for servers and food runners which is much higher paying then my position as a host. When I asked if I would be able to move up into a serving or food runner position I was told that because I'm pregnant and would eventually need a few months off for Maternity leave they can't and will not spend the time and money to train me in a new position even though i would only be leaving for a few months.  Being 11 weeks pregnant I'm proned to being overly sensitive but i feel as if I wasn't pregnant and needing leave time they would have no problem moving me into a better position my general manager was all for training me until the owners said no due to the fact I would need a few months off to have my baby and recover. Do you think my job is discriminating against promoting me because I'm pregnant or am I just being hormonal?