Am I being unreasonable?

[Aggie72]

Hi I’m new but just wanted other mums opinions.
I’ve just started a new job it’s part time but I rely heavily on my earnings as a single parent.
My old job meant I worked shifts so had some days off in the week, my new job is Monday Friday during school hours. And it’s better paid.My sons dad has always relied on me to look after him when he’s been off sick which hasn’t been a problem before and I knew our son was suffering this week and asked his dad if he could for once take the time off to care for him if he couldn’t go in to school, he said yes that’s fair, however with my new job just 3 weeks in my son was poorly today and I rang his dad who was at work he is a nurse and he said he couldn’t leave as they were short staffed!! So I’ve had to not go to work today( also in a care environment) I’m still in my probation period and really worried as know the care home were also short staffed.
I’ve had a massive falling out with his dad, called him selfish and that again everything has fallen to me.
I could potentially lose my job and I won’t get paid for today, he has worked for the nhs for 30 years and gets paid if he is off.
Am I being unreasonable to feel like I’m yet again being taken for granted ?

Can you reach an agreement that you will take it in turns to have time off when your DC is ill?

We already had, or do I thought. I made it abundantly clear to him that as it’s a new job he would need to be on hand over the next week or so to help as our sons been feeling rubbish all week so he knew it might happen and yes of course we would take it in turns I’m just cross that the first time he just can’t possibly leave!! I appreciate it’s difficult but employers need to be accepting that both parents may have to take time at short notice surely?! My new employer was not impressed I could tell 😓