Hello,
I have gone through your query and understood your concern. If the dates you have given are correct, this is not the proper time to answer this query after such a long time. Yet, I would like to offer a few suggestions. Firstly, you do not ruin the life of one child by giving birth to another child. In fact, you can balance very well between both with a little outside help. Secondly, an induced medical abortion can be safe when performed under medical supervision and with all necessary protocol. Lastly, if you are still lactating, the medications used to induce the abortion are likely to be secreted in the breast milk and hence, you may have to stop feeding the baby temporarily. Hope you find this information useful.