got my BFP after 3.5 years. how do I tell my TTC sister inlaw

Lj

Me and my husband have been trying to conceive our 2nd child for 3 and a half years. I felt a lot of common pregnancy symptoms and thought well what would it hurt.to take another test at night instead of waiting for morning. much to my surprise it said pregnant! after my shock subsided I cried and paces while I waited for my hubs to get home. we told our parents and a friend that has been pressuring me to get my bridesmaids dress ordered now for her wedding in June. We also called my sister-in-law, who has been TTC with her husband for about a year or more. I wanted her to know before the whole family found out. She said she was gonna cry and that's so great. I remember finding out about a good friend being pregnant with her 3rd baby in a 3 year span (she experienced a still birth with her first) she told me in a group of other gals. it was a gut punch. And as I put my DD boots on I just started down and started sobbing after she left the room. all the other girls knew what our struggle had been and surrounded me with hugs and loves. one of which was never able to have a term full term pregnancy and adopted 3 children, so she got it, she knew the feeling. thinking this Experince I wanted make sure my SIL was at home. I guess my big question is, should I follow up with her? reassure he? give her some time?