I am not going to get on my high horse and tell you that you should or shouldn't go through with this. This is your decision.

What I do suggest is a careful evaluation of your circumstances. That which might appear negative - can it be surmounted at all? What supports will you have should this baby arrive (for that matter what supports have you now?). What economic and circumstances will you be in? Are there other options to investigate?

I admit though that the situation with the father sounds very uncomfortable to me.

Finally, the institution which will perform this procedure will have available to you extensive resources and counseling to assist your decision. Contact them ASAP.