Grieving Brothers Miscarriage

☹️😢

My brothers wife and I are great friends. We decided to get pregnant together. As far out and bogus as that sounds lol.. we share the same cycle. All of the women in my family do actually. We all start our periods within days of each other. We’ve both been trying to conceive for 7 months. We both ended up pregnant, together! I got my BFP April 5th, she got hers April 8th. I was feeling bummed out having cramps, was told I was at risk of ectopic. Two ultrasounds showing nothing. All of the families worry were aimed towards me. Well my SIL had her dating ultrasound today and the sac measured 8 weeks but the embryo measured 5 weeks. There was no fetal pole. She’s had no pregnancy symptoms and never has with any of her pregnancies. We didn’t think anything of it. She told me my brother thinks it’s his fault. They just got home and he’s not talking, wants to sleep for the night and it’s only 6pm. I am hurt for them. I feel this sense of guilt or like I need to quietly enjoy my pregnancy. I hear about people saying it’s rude and insensitive to celebrate pregnancy in front of people who’ve suffered from a loss. How can I share my pregnancy with them and family without bringing up this hurt for them!!? Every time I have an appointment or scan, my belly grows, i feel like it’s going to be a sad reminder for them. I’m just torn right now.