Advice please

So i wasn’t sure where to post this. Me and my SO live in a tiny one bed flat for £500pcm. A lot for our area. When we moved it was done very quickly as we’d just called out with my Mum and couldn’t stay there anymore after a year and a half. The flat was just finished brand new and shiny. Since moving in back in july it’s become clear it was a rush job. The front door doesn’t shut properly, bathroom handles fall off, there’s holes in the walls. Nightmare. Now my best friend who has a nine month old baby and her boyfriend (not baby’s daddy but amazing guy who’s taken up the role of Daddy Dent (his surname)) are about to find them selves a medium sized home for about £500pcm two bedroom house. We were talking and we’ve had the idea of the five of us renting a larger, more spacious four/five bed house. My partner and I are TTC.

Now if we did this it would be anywhere from £850pcm to £1150pcm but then we can split the council tax. WiFi. Tv license, nextflix etc and it would be about £300 cheaper for us each month and we’d have more space. I currently work but childcare in my area for the hours I work as a teacher would be the same as I earn in a month so I’m planning to stop working for a couple years or part time it and claim some benefits when/if I have the baby so I can be with the baby and only take a minor pay cut (advice on this too please, I don’t want to be a scrounger but it would literally be my wage £900pcm to put baby in day care so I’d work for nothing and miss all that special time.)

Now if I lived with these guys Elle would already be Home and happy to watch my baby too so I could work part time or at least not be alone when I’m with baby which could be a god send, also her having an older baby has more experience than me. However on top of this I know they have plans to try for a baby sometime next year.

We’re all quite young, she’s 18 with her SO 23 and I’m 19, SO 21. I’m just worried we’ll move in and it won’t be good. But there’s so many pros £300 a month saved is great and bulk buying food is cheaper and we could get a big house with a lovely garden and space. Please could I have some advice on the housing situation

To update slightly. I know 19 seems young but the history in my family is infertility by 30 (linked to fibromyalgia through my mums side) so I’m worried if I don’t have kids soon I might not be able too. Plus I am already fully qualified and working so I’m not worried about my career

Thank you in advance any advice is welcome 💝💝