Need some advice

So there’s the little girl that’s claiming that the baby she’s having is my fiancé’s baby but she 6 almost 7 months pregnant and I’ve been back with him for almost 9 months she’s due at the end of February and also I’m having his second child and I’m 10 weeks right now,we lost our first 8 months ago. Does the math add up to any of you? I’ve run over it so many times and i just need some other opinions so I can calm down.