Do I tell my boss I am starting IFV?

Please can you advise if you think I should tell my boss about my fertility struggles and that we are starting IFV soon. I have unexplained infertility and I think it’s mostly due to work stress. My boss is very nice and I am sure would be supportive in making the few weeks less stressful if I spoke to him.

I just want to try prevent anything from going wrong we can only afford to try once.

Also please advise when in your treatment should you avoid stress the most? Before or after implementation?

Your advise will be greatly appreciate!