PLEASE, let me be the first to encourage you not to go through with your intentions! I just could not ignore your question even though I am not an expert on the subject matter. I do understand moral laws, principle laws, and biblical laws and its ultimate consequences. If your intent to terminate unborn life is as a result of a mistake - I sympatize with you, however, I would rather live with such mistakes than to violate ultimate laws.
Also, I am not an activist or pro anything, but trying to keep you from regret and troubled mind for the rest of your life. Please understand that you have options- you just need to find the right option. First, you begin by talking to someone ( spiritual adviser, counselor, trusted friend and most importantly to God or whoever you can relate to). There is no doubt that your circumstances may not be unique, which all the more reason why I am confident that you will be just fine if you do not go through with your question.
Let me ask you a question! Even if you are not governed by any law such as i mentioned - what if your birth mother posed a question like yours or had intentions to carryout such act while you were still in her womb. How would this make you feel knowing this?
Again, you need to give this serious consideration. You will be very glad you did down the line.
No one is going to judge you - but your conscience and the creator of life.