Kirsty, who is a mother of two, said she was touched by Bianca's words to her unborn baby and felt the need to help.
"When I first heard that I was on my way to my son's soccer game. I was heavily heavily hysterical in my car going there. I was just blown away by that," she said.
"For me, I've had an easy journey with having children so I really do feel for women that struggle."
Kirsty revealed that she felt this wasn't a big deal, and it was "natural" after not struggling through her own pregnancies.
Bianca was left shocked with Kirsty revealed the reason for her call.
"I am actually here to offer you my womb," Kirsty said, before an overwhelmed Bianca got emotional.
"That's really beautiful, I wasn't expecting that. Thank you," Bianca responded.
"Jesus... you can't just throw a womb question at me. It's not like 'Do you want to have a Nutella sandwich?' it's like... a womb!"
"It's a really big thing to offer, it's huge, and you've absolutely thrown me because I had no idea this was going to happen. I'm really at a place in my life where I really don't know what to do," she said.
"It's frightening. And it's a massive decision. I don't want to do it alone but I don't think I have a choice."
Bianca and Kirsty discussed the possible issues that could arise from the process and both agreed that there would be a need for mandatory counselling.
"To see you actually growing my child, it would be beautiful and amazing, but I think you probably would need some counselling to prepare you," she said.
"Do you want to stay in the baby's life? To me I would be really torn. There is a part of me that would want you in the baby's life - I would say 'Kirsty is the reason you are here'."
The pair ended their chat with Bianca stating that she would need to think hard about the decision and that she would do so while on holiday.
"Thank you, I really don't know what to say. I feel like I'm going to break down and cry again. Thank you for offering me your womb," she said.
Bianca has since posted on Instagram stating "I'm not looking for a surrogate tbh and I have put the babymaking: IVF etc on hold for a while right now while I just get used to a new job and a new life."
