Just tell them straight out. Im sure they'll be mad at first.
Not that I know of.
No and its very dangerous to both mother and child.

I would be honest; don't withhold any info (ie: father's id); and just own up to the responsibility. After all, you talked the talk, now it's time to walk the walk. Don't kid yourself into thinking you can hide it -- your parents will be much more upset if they find out later. If there's help to be had from them, take it.