Doctor appointments and work

Any tips for juggling doctor appointments and a full time job? I'm not ready to tell my work since I'm only 8 weeks but between a few other health needs and now the beginning of pregnancy, I feel self conscious about all the time I'm slipping out early or working from home due to appointments. My boss has never given me a hard time about it and my company generally supports flex hours and options but I'm still constantly worried every time I have to tell him I'm leaving early or working from home!