@FisherFamily I just posted about this on another thread today...
"BTW - I'm 16 weeks and 4 days. Would it be crazy for my husband and I to have felt the baby kicking this morning? I felt some blurps, touched my belly, felt it on my hand, then woke up husband and HE could feel it too! Everyone already thinks I'm delusional when I tell them I feel lots of movement already ("It's just gas"... I'm pretty sure my uterus doesn't have gas)."
... And I'm also pretty sure there's only one in there. That was the first time the movement was so big - usually it's just little fluttery twitchy or flip-floppy feelings.
At my 16 week appointment last week I told MW that I was feeling the baby and she obviously didn't believe either me because she said 5 seconds later "You may not start feeling anything until as late as 24 weeks since it's your first". (Funny aside: I told her the baby was on my right side, she started the doppler on my left and couldn't find the heartbeat until she moved to the right - Boo-ya! In yo face!)
This is my first, but my fundus is super high (especially in the AM) so maybe that's our trick? I mean, I guess you can't rule out any possibilities, but judging by your previous history with early movement I wouldn't linger on the twin thoughts for too long. Maybe I'm just saying that to make myself feel better, haha!