Postpartum Anxiety 10m PP?

My little one has just turned 10 months and is doing wonderful! He is hitting all of his milestones and is advanced in some so I KNOW there is nothing to worry about.. yet all of a sudden, as if out of no where, I am having anxious thoughts quite often about his development and my WFH. I WFH full time 5 days a week, my partner works 3 days a week out of the home, 2 of them are during my working days and so I watch baby and work at the same time. I have been working full time since he was only 5 days old (not by choice) and my partner went back to work 3 days per week when my son turned 7 months. Everything has been fine but suddenly just last week my mind is full of anxiety about my inability to give him as much attention a couple days a week and if this is affecting his development, i also have sad thoughts about when he was younger and i had to work though my partner was there i feel guilty i couldnt give 100% of my time to my son. Is it normal to develop PP anxiety this late on? Or is not PP anxiety and just normal feelings? Ive been very lucky to not experience much anxiety since he was born.