Unless you're fixed on starting a training contract at a certain date for a certain firm, I wouldn't worry about any "deadlines". I applied for a training contract after I'd competed my law degree and the professional finals as I wasn't sure if I wanted to qualify as a lawyer. Once I got my offer of a training contract I worked as a paralegal at another firm and took some time off to travel (this was all pre children).
Given what's happening on the personal front for you and your uncertainty about being a lawyer, how about looking at paralegal options in-house?
There are likely to be more part time options and hours won't be as demanding. Pay will be less than the qualified lawyers but pretty decent overall and usually the main requirement is some form of legal studies. If you decide later you want to qualify as a lawyer, some companies can organise that for you in-house.
Paralegals can go on to gain specialisms e.g. Corporate Secretarial and Corporate Governance work which can make them sought after and helps create a distinct career path.
When you say you worked in-house but not as a lawyer was that as a paralegal?
If that doesn't appeal, other areas which are worth looking at where the law degree will be helpful are in relation to compliance, data protection and HR.
There are specialist data protection courses if that's an area you want to explore and you don't have to be a qualified lawyer for some in house DP Manager/Officer roles.
DP probably doesn't sound very exciting but it's a growth area as companies have to ensure they comply with new regulations.
In terms of sector focus, life sciences (eg pharma companies) is a good one to get into.
I now work in recruitment, I fell into it unexpectedly when I was looking for a new job as I was moving countries. I'd worked for a London law firm for a few years and knew of someone who had moved into recruitment but hadn't thought about it as a career until the headhunter I went to see offered me a job. It's a very saturated market in the UK and service levels within the recruitment industry can be erratic which can give the profession a bad name, I enjoy what I do but wouldn't recommend it unless you're sales and service focused and comfortable with business development.
Main thing is don't feel pressured to do something by an artificial deadline, not applying for a training contract now doesn't mean you lose the option to work as a lawyer or in the legal field in the future.
From a practical perspective, whatever you decide to do, if you can gain some practical work experience in your preferred sector before you expand your family, it's easier to resume your career after an extended maternity gap, even if the experience pre break was relatively brief.
Also possible the other way, it just takes more grit and determination!