I can understand that, I would have been a very overwhelmed by this and “pressured” by thought if I miscarried you’d have hired and trained up someone and then either have to let them go, or even me.
But it’s not bonkers or unreasonable - the law is on her side
She doesn’t have to formally request maternity leave until 15 weeks before due date. That is point that you may have been told legally and she must tell you. 5is is point most sane companies start to formally document the request for maternity leave, not before. And it’s the point you could legitimately start a recruitment process.
right now, you are putting pressure on her, albeit not deliberately but very ignorantly, based on her telling you at a very extremely early point initially (which is why it is unwise to tell employers unless you have to until you have to) . Even the 20 week scan is way before the 15 week deadline and she is doing YOU a favour in helping you plan your business. You are taking a very dodgy advantage of her.
She’s not 20 weeks yet- FGS she cold decide to get an abortion up to 24 weeks for personal reasons or because of abnormalities found at later scans. Remember that. And that it is none of your business. There is No viable baby and no guaranteed need of maternity leave until after 24 weeks or beyond. And no, that’s not a coincidence of being just shy of the 15 week before due date deadline, it’s EXACTLY why the deadline is where it is. At the 25 week point where a pregnancy becomes likely to result in a viable live birth and need for maternity leave. Do the maths.
At the 15 weeks deadline you have time to recruit and train up a replacement- if you haven’t, more fool YOU. This is not her problem to solve. You do realise she could get run over by a bus next week and not be able to come into work for a year, or 2 or ever. what would you do then?
I’d also warn you that if she has not given you permission to discuss her medical condition and pregnancy you are breaking the law to discuss it with anyone else including starting a recruitment process. You actually need her express permission to even post a job for “maternity cover” if it is identifiable as her job, which given specialist role I assume it would be, if she is before the 15 week deadline. Otherwise you are sharing her private medical information very publicly. Right now you are putting pressure on her to do that sharing and are flying close to the wind with data protection.
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If you were in a big organisation with an HR dept who had a eye out for the law and duty of care, you’d not be able to get away with this and putting that sort of pressure on her.
leave the poor women alone and stop trying to jump the gun. Sometimes things can’t be done in the way you want or a business wants, for a bloody good reason. And I was a boss too, so know it can have a big impact- but a good manager knows when to bite their tongue and suck it up where the law is concerned.