To Paddington, I worked in Payroll and am not a pilot and nothing to do with aviation. The £117 after 6 weeks seems to be the minimum for statutory maternity pay I think you get it for something like 33 weeks might be longer. Check the HMRC website for full details.
The thing is that your company will be able to reclaim 92% of the smp that you are paid from the National Insurance they pay to the HMRC .
As others have said , you choose to have a family you must budget accordingly . Things are tight for everyone . All the best.