Waiting to tell others that we are having another baby...

My husband and I have 3 children ages 9, 8, and 4.  I am 10+4 with our 4th baby.  In the past year I have miscarried 2 times.  No one knows about those.  We were not trying to conceive nor were we actively trying not to conceive (using the pull-out method only).  We have not told any of our friends or family that we are expecting.  I just want to wait until I'm 12-13 weeks since it's a "safer" time concerning having a miscarriage.  My husband thinks it's ridiculous to wait.  I've tried talking to him but he just doesn't "get it".  A woman looks at a miscarriage differently.  He didn't get emotional about the previous miscarriages but I did.  It takes him a while to develop that bond with the unborn baby but my bond is instant. Another issue is that if we tell our children then we end up with a miscarriage, it would be difficult to explain.  Does any one else see my points?