Since your husband is supportive then my advice is to keep the baby. Good that he don't mind with having another child but make sure he helps you around now and when the baby is born or whenever you need him to. Your mental health is also very important.
Abortion is an easy way out but the guilt is forever. And you may also have difficulties trying for another baby in the future, if you wish to add another one, which happens to many, including my circle of friends.
Take extra precautions, a contraceptive, IUD, pills, etc after birth. It will be exhausting having little kids and a baby. I've been there and like you I wasn't ready but I still keep my baby. When they grow up, you'll thank yourself that despite the exhaustion, you are still able to handle and take care of 3 kids and you're glad that you did not follow your heart to terminate your innocent baby.
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