Taking off work for SO MANY appointments

So I'm going in monthly to have my progesterone levels tested, I'm seeing a fertility specialist, I have an HSG scheduled, and I was even referred to see a dietician monthly, which means I'm leaving work for A LOT of different appointments. And I'm just wondering what to tell the people I work with. I'm very fortunate to work with a great team and I want to explain to them why I'm always taking off but I'm not sure what to tell them or how much to tell them. I don't want them to worry but I also don't want to make them uncomfortable with TMI. I'm not sure how to handle this appropriately and professionally. Has anyone else had all these tests and appointments take them away from work and what's the best way to address it?