First postpartum sex (TMI warning)

Im 2 and a half almost 3 months postpartum and last night me and my SO had sex for the first time since before I gave birth because we were both very nervous because I had some pretty bad tearing and an allergic reaction to the lube they used during birth ( I kid you not my lady bits were swollen to the size of a softball for 4 days I couldn't even sit down) so all and all it was a rough postpartum recovery. And sex was so different! First off I was super wet, ever since puberty I've struggled with vaginal dryness (lube is a must) and pretty gnarly post sex pain even with lube but this time I was practically dripping and no pain after sex for the first time in my life. But that's not the weirdest part! It felt tighter than before pregnancy/ birth, at first I thought it was just me thinking it felt tighter because it was a little sore at first and it's been so long but this morning my hubby comes up to me and says "sorry if this is a weird question sweetheart did you get tighter?" And ik the vagina is a muscle it supposedly goes back to normal but I was convinced I'd be looser or at the very least just barely back to normal but definitely not tighter! Is this even possible? And how does it happen?