Emotions are running high..

I had to tell my Manager at work today about my pregnancy and she said she already knew as word has spread. She basically told me that because I'm only 5 weeks, I've told her too early because its too early to do a risk assessment, so she isn't going to do anything for now. Also she basically said I'm to young to be pregnant.. Bearing in mind someone else i work with is pregnant and she's the same age as me and has a child already, so what my manager was trying to say was is that I'm too immature and childish to cope with a baby. So she's kinda pissed on my parade a bit and made me feel so small. It feels like already people are starting to doubt me.