Unfortunately I haven't got any advice etc. Just wanted to send you lots of hugs and warm thoughts!
My thoughts are try to get hold of someone 'professional' to talk it through with. Nothing bad can come of that, and you never know, they hopefully will be able to help you sort your thoughts out.
Sounds like you shouldn't make any rush decisions either way though, until you have thought it through and talked to some people. Posting on here is a good start, and I am so glad you did. Some of the ladies on here will be able to help you I'm sure, so many amazing people on here who have been through so many things.
Don't feel alone, there will be a few people on this forum alone who would have had thoughts similar to this, neverminds heaps of people in NZ in general.
I hope you don't mind, I tried to find a few websites online who specialise in helping woman who are pregnant and need a little support for themselves/their families.
Pregnancy Help Inc
Mother's Matter Mother's matter is a site mainly for post natal depression. I wouldn't have a clue if this could be something which may be affecting you, but as someone said earlier, knowledge helps. I know I was also directed to this website when my Dr said I couldn't come off anti-depressants while pregnant, so it has a lot of information about anything to do with feeling 'down' while being pregnant.
Continue to reach out for help, and remember you're not alone. Big hugs and warm wishes.