Aibu to say no to work?

[YummyDollie]

Ok not sure if this is an aibu or a what would you do style post but here goes. Backstory: I worked for a woman teaching various dance classes at her dance school for ages 18 months to 18 for around 2 years I ended up leaving to cocentrate on my last few months of my dance degree. Fast forward to now I have my dance degree I have a Monday to Friday 9-5 job now and am 27 weeks pregnant, the lady I worked for was in a bit of a pickle in November time and was severely short staffed so in order for her to not loose money I offered to teach the odd class here and there which worked well when I was still able to run around like a loon after a class of 25 children teaching them to dance whilst demonstrating the moves fully myself. It's now January and I'm having a few problems with my pregnancy and have been told aside from my day job to take it easy and cut down on the fitness classes etc so I am, now i told her all this explained I'd had a few scares in and out of maternity assesment unit with baby etc so she's asked me today to cover a shift this Saturday morning (2 days from now) this would be a three hour shift 9am - 12pm paid at minimum wage (the rubbish pay was partly why I left this job also as minimum wage for what you do as a dance teacher/instructor with this age range and volume of pupils in my opinion is nowhere near enough!) anyway it would cost me £8.00 to get to work and back so after petrol and a one hour commute for three hours of solid teaching I would make around £12.00... To me this isn't enough to be financially viable for me and i think of rather spend the morning pottering about doing bits to the little ones nursery. Am I being unreasonable to say no under these circumstances when it was me that offered the odd help back in November when I was feeling brighter and more with it?! And what would you do/say if you think saying no is the right thing as I don't want to offend this lady as she's slightly highly strung so can't be bothered with offending her and getting a snotty reply (Also now seriously hoping this lady isn't a secret mumsnetter as I've seriously outed myself if so!) apologies for spelling mistakes/auto correct mistake my IPhone has a mind of its own! If you don't understand something just ask I've rush typed this on a coffee break to get it all out whilst its on my mind or baby brain will jumble it by 5pm haha!

absolutely say no, you have to think about yourself and if you've been told to take things a bit easier then you should! I think given you're having some pregnancy related problems then she shouldn't have any issue with you saying no.

YANBU, and she might not have staffing problems if she paid properly.

I am unable to cover the class for you on Saturday, Doctor's orders are to take tbings easy and I do not feel that well.

Take all emotion out if it. If she asks you again directlyir I.directky state that.you have had this conversation before abd you stand by what you have already told her.

You owe her.nothing.

If you won't think about yourself, think about your baby!! You have been told to rest so rest.

Thank you everyone feel slightly reassured now that I'm not being an utter cow to say no! Also sole source I think I'm going to copy and paste that reply and use that great idea to take emotion out of it. Thanks again everyone

YANBU, explain that you need to rest as per doctors orders, so it will be a fair while before you will be teaching any classes again.

It's not your fault and your health and that of your baby has to be priority.

It's an extra, so she can ask, but you don't have to say yes. And what would she have done if you had been away? exactly the same as she will have to do this time: get someone else!