I'm so sorry for your loss. It's such a difficult time.
The most important thing is to do what you need. You are going through one of the most awful experiences a woman can have, and you deserve every kindness from others and from yourself.
I think, if the only thing holding you back is worry about the problems your family members are having, you should tell them. If you're concerned that they may not be able to support you, or at least be sympathetic, than maybe not.
I was not able to tell my family, because I was pregnant out of wedlock and my partner and I split up the same day I miscarried. In my family, those are unforgivable offenses, as is the loss of a baby. Not only would my family be unsupportive, they'd be harmed by the knowledge that I'd been pregnant and miscarried, and that would have been unbearable for me.
If you decide not to tell your family, is there a friend you can talk to? MN is great, but sometimes you need a RL person there with you.
Hope you start feeling better soon. Hugs to you and your family.