No, I don't think you are being made out to be a trollop or anything of the sort.
I think your mum is just finding things difficult to accept. There isn't much you can do. I just talk about the pregnancy anyway, whether she likes it or not. I don't rely on my mum for money either, but she still feels she should have the final say on what I do in my life! As if I am going to check for her approval...! And then when I don't do what she likes, she gets worried and sulks.
It will take time, but she will come round when she sees you getting on with your life, and that things are going well.
To give you an example, my MIL has 2 children. Her daughter is 27, her son (my partner) is 22. Her daughter just had her second baby, to a second partner. She doesn't live with him. When she announced the pregnancy MIL was angry at her for putting herself in the position she had done, when she had just started to get herself on her feet - first child started school, moved out of MIL's in to a council house etc.
You would have thought she would have been even more angry when DP announced our pregnancy a couple of months later. Given that DP is 22, and I am older with another child. But no, she was very happy for us. The difference being that she had seen our relationship develop over a few years, and I own my house, have a good income, 2 cars, etc etc. She was happy that she had seen enough to convince her that we were stable both as a couple, and financially.
Now that SIL's baby is here, and her partner has proved to be a decent father to the baby, she is more accepting of the situation.
You mum just needs to see more evidence that the probable outcome will be good for you and your daughter.