Pauly D's Baby Mama Has Texts ... He Wanted Abortion

10:50 A.M. PDT -- Pauly just sent a Tweet that seems to address the situation: "Sometimes in life things aren't planned and they may even scare you at first, but they end up being a blessing."

Pauly D wanted his baby mama to have an abortion ... and here's how we know. His baby mama is trying to sell texts he sent to her urging her to end the pregnancy.

TMZ has learned ... Amanda Markert is trying to hawk the text messages to various media outlets in which Pauly asked her to end the pregnancy and he offered to foot the bill.

Sources tell TMZ ... at the time Pauly felt it was the right thing to do, partly because of the way the baby was conceived. There was no plan to have a child ... and the fact is it was a one-night stand.

As TMZ first reported ... Pauly has come around in a big way, not only trying to see the baby but he's fighting for custody.

By the way, get this -- sources close to Pauly say Amanda actually took the money for the abortion, but then ... obviously ... decided to keep the child.