How do I tell my partner

So I did a pregnancy test today as I haven’t been feeling 100% recently. It came back positive which is really quite a surprise as I am on the pill which I am taking religiously at the same time every day. My little girl is 7 months. I know I really couldn’t go through with a termination. I haven’t told my partner yet as I’m too scared as I don’t think his going to take it well how do I tell him without him losing his shit at me