How do I tell Hubby?

I just took a pregnancy test and its positive!!! I'm excited but very nervous. I've had 2 miscarriages. The first being in May and the second in November. Since my last miscarriage things have been stressful for me and my husband. Now I'm nervous to tell him that I'm pregnant because it's still so early. I'm only 4 weeks and I'm not holding my breath. Should I just tell him now or should I wait a few weeks?