4th baby fears

So I found out I'm expecting my 4th baby on March 4th, after trying for 9 months. I had a miscarriage last June, so this a rainbow baby. But the miscarriage fear is getting to me lately. I'm a week away from when I lost my baby last year and it's really messing with me. I'm taking tests just to make sure my HCG isn't dropping. It's crazy and stressful. 
 Also I'm dreading telling anyone we are pregnant with our 4th. People aren't very understanding or nice about having several children. All of our babies were planned and we love them all dearly. I'm not sure what it is about having more than 2 kids that makes people treat you poorly. We got a lot of negative comments when we got pregnant with our 3rd, so I know this one is going to be even worse. Wondering if I should just rip off the bandaid early or wait till the cute chubby baby is here to tell people. Lol 
I'm more scared to tell my mom, who's loves her 3 grandkids but isn't a huge kid person. Honestly, I don't think she would have had me or my sisters if my dad hadn't convinced her to do it. Don't get me wrong she is awesome and loves us, just not a big socializing, baking cookies, and doing crafts, kind of mom/grandma. More of a loner, playing video games, and reading a stack of books, kind of mom/grandma. So I'm sure she'll be excited after the initial "wth?!?" Wears off but I'm still dreading it. 
Anybody else dealing with any of these stressful situations?