Firstly, also - few of us ever think we will be in this position, so be kind to yourself first off.
I know you've spoken to a counsellor, but have you considered having a chat with a GP or obstetrician regarding your fears over health issues? Generally, they tend to promote the right to choice but have an open door policy if health concerns are preventing you from wanting the pregnancy - I'd strongly recommend at least speaking it through with them before you decide definitely either way.
As for practical and personal circumstances, I can see why having a child isn't something you'd view as beneficial right now in light of the concerns you have financially, physically and within a brand new relationship. But lots of people can and do cope in those situations, and furthermore, plenty of people have had abortions in situations that look on paper, a more desirable time to have a child (myself included). So, if you feel YOU want this child, you CAN adapt around situations.