Questions: Break Up & Divorce

Providing it won't end in divorce?

Yes talking about make up 💕 XoXoXo

Hi guys
So my and my partner has been together for years and now we have a baby
I gave birth over a month ago to our daughter

Anyway so I have this friend
she's been in multiple relationships
But she recently broke up with her ex of 3 years
And now she's hooking up with different guys etc
When i gave birth, she came to visit the hospital and gave me chocolates and flowers

But thing is… now she's pregnant?
She was so happy to tell me

She said she's going to keep the baby even when the guy she hooked up with blocked her and disappeared

And the guy that she hooked up with.. is the same nationality as my partner

The thing is.. why did she suddenly want to get pregnant after I gave birth?
Why didn't she get pregnant with her ex when they were together for 3 years?
Is she copying me?

My ex and I were in a 4.5 year relationship before he ended it about 7 months ago now. His mom and I, while I was with her son, didn't have the best relationship due to external factors like my family's stance on the union and other things since it was an interracial relationship. After the split, she became kind towards me and helped me emotionally/mentally as a mother figure, basically treating me drastically differently than before. She even told me the day after the breakup that she believes her son needs to mature during this time to be ready for marriage with me since we were planning on getting engaged this upcoming year. That obviously should've been kept to herself since I was in a vulnerable place and assumed that he told her that, which led to delayed healing.

Since then, I have met up with my ex's parents a couple of times just because they wanted to see me, and they have treated me with tremendous respect and kindness. They invited me to their home to help paint furniture, and during that time, the mom kept referring to me as daughter-in-law even though my ex and I hadn't spoken to each other in months. We also talked about my healing during that time, and she supported my journey. Her son's birthday was in October, and she asked if I wished him a happy birthday. I said no since he told me that he wasn't comfortable with me communicating with him at the beginning of the breakup. My birthday was in December, and she didn't wish me a happy birthday, but today, she wished me a happy holiday season and asked if I was dating anyone. I didn't respond to her question and was taken aback by it since there was no reason for her to ask that. I have removed him and that whole family from my social medias, so maybe that's part of the reason why? Do you think my ex is asking her to find out on his behalf? Why wouldn't he just message me to find out?