Go back to work or continue to stay home?

So I am from Canada and have a one year old son. I have been on maternity leave with him for a year and had planned to continue to stay off with him due to the pandemic. Where I live, daycares are all still closed and restrictions are still in place. Prior to the pandemic, I had applied for a position that is out of my field of study. I did not think I would get the job, but to my surprise, I was just offered the position. It is full time, excellent pay and full benefits. The only issue I am facing is the fact that the job has an entire year probationary period and I had planned to start trying for baby number 2 soon. I had met with my OB and due to fertility issues and my age, she advised that if I wanted a second child it might be in my best interest to not wait too long to start trying. Another dilemma I am facing is the fact that the employer made it clear that the job is very challenging and can be stressful at times. We are very fortunate in the fact that my husband has a high paying job and technically, I do not have to work. Any money I bring in is extra savings and spending money for our family. I had planned to stay off until fall and look for a part time job for a little extra income and to collect my 600hrs to qualify for EI again. Now that I have this offer I am so stuck on what to do. Part of me wants to take it as I feel it is a great opportunity, but the other part of me worries that it will take a toll on me being that it is stressful, I have no idea what I will do for child care and I worry about postponing having another baby. A few years ago I would have jumped at an opportunity like this, but having my son has changed my opinion completely on my career. I feel as though I would rather look for something part time and be home with my son more until he is older. I just do not want to regret this opportunity down the line.

Sorry for the long rant, I just wanted you to get the full picture. What would you do if you were in my situation? I really need some advice from an outside perspective.