I'm so sorry for your friend's loss! Of course you're going to be paranoid! You're a good mommy! My daughter's movements never really "decreased" but they CHANGED. Like, not so many kicks but more shifts in the womb as there was less and less room. It's perfectly normal for babies to have "lazy" days but if you ever feel the need to get it checked out for your peace of mind, please go ahead and do so! If you go in to the doctor or hospital because you haven't felt your baby since that morning, and it turns out to be fine, and people get annoyed with your false alarms, then they're not very good at their jobs. Especially after your friend's loss, being safe rather than sorry will make you feel a lot more better than trying to talk yourself out of worrying, because it's not gonna happen lol I want to say around 34 weeks or so, the movements started changing. There were a lot less definite movements like kicks but turning and stretching became the new norm, which can feel like less.
Oh thank you so much for this answer! It is very helpful! I am definitely starting to notice more rolls than kicks! :)