What are you looking for pros and cons on?
I would also recommend getting married first - you can apply for surplus housing if you have a child together but you are warned throughout the whole process that they can, at any point, give you 28 days to vacate if your house is required for a married couple. Being married also protects you financially - Citizen’s advice has a whole page devoted to the differences between cohabitation and being married.
You’ll find a mixed bag of SAHPs and working parents across all areas of the forces, like you would in any industry. I would recommend (from personal experience) working as long as you can, if you’re able to.
Are you likely to move regularly with his job? This can massively impact childcare and practical support from family/friends. Financially it could be hard and you might actually enjoy working some evenings to still feel like yourself.
Is he likely to get deployed overseas any time soon? If you were very close to term, there’s no guarantee that he would get back in time to support you throughout labour. You would also be solely responsible for childcare when he was away.
I don’t say any of this to be harsh - I am a military spouse myself and it’s hard work. We’re currently a long way from both sides of the family and I’m pregnant. I’ve had to accept that I will have no support for at least the first 18 months of our child’s life and that I will not be financially independent for a while (overseas). Thankfully DH is not financially abusive and we have shared finances.
As PP said, you need to have a very clear conversation about expectations and finances - this is not military specific, it’s a good starting point for all couples who are starting a family. I would not have moved overseas with DH or not used contraception if he wasn’t on the same page, supportive or understanding of the implications of me not working and having a child.