Spoke to my nurse and they diagnosed me with severe Antepartum depression which explains the rapid…

Spoke to my nurse and they diagnosed me with severe Antepartum depression which explains the rapid weightloss, the over the top and frequent mood changes the being excited one day and not wanting anything to do with it the next. I'm terrifed I was told this is serious and could be what's causing all these issues that it could cause preterm labor and an unhappy baby. Why cant I do just this one thing right, God finally gives me the chance and this happens.