Antenatal Anxiety and Depression

I'm 17 weeks pregnant and for the past 2 months I've been very very depressed. I'm scared that I'll be a horrible mother and I won't be able to give my baby what it needs. I'm also terrified of giving birth. I can't seem to think about anything else. I have been hiding my feelings from my boyfriend until now and he just broke up with me because of it. Now all I can think about is ending it all 😢 I just really need some positive words and encouragement please.