Oh no, Lucy. I'm so sorry to hear that. I hope the midwife is mistaken.
I told DH right away (well, an hour later because he wasn't home when I tested), and yesterday I told my 4 closest girlfriends. I had to tell someone, and I see one of those friends at least once a week, so she'd have caught on anyway (the others aren't local, but I couldn't only tell one of them). I think a few of them have told spouses/parents who won't be in a position to leak it to anyone who knows me.
I'll tell my brother and SIL in the next week or two. They have an 8 month old, and SIL is saving some of his stuff because she knew we were trying, and I may need their help covering it up from mom on a little family vacation we're all taking in late July. Plus it would be good to have someone to ask for advice. Mom's a serious meddler (she got on SIL for having a small cup of coffee at a barbecue when she was pregnant), so she can just wait to find out like everyone else.