I haven't ever felt phantom baby kicks but this is what happened to me last month:
I'm 9 months PP. Still no AF. I started getting lots of cramping last month so I thought that my AF was on it's way but then it didn't show up(with all my 5 previous pregnancies; I always felt like I was about to have my AF bc of the cramps but then I would get a BFP instead of AF.) ....So I thought that maybe it was an early pregnancy sign.
Last month I tested and it was BFN. (of course my DH too had a V a year ago so I guess I was just holding on to false hope
)
But I am BF and last month I started feeding solids, and baby started sleeping through the night for about 5 days. So I think my body was secreting (or not) hormones bc my milk supply was lowering in response to not nursing as much. Then a change caused baby to start waking up again and nursing several times during the night again. So I started nursing more and my milk supply went up again. The cramps went away.
So, the hormones being secreted while nursing can make your body do crazy things.
I would suggest charting whether you want to avoid pregnancy or not. That way you can detect if and when you have ovulated and can avoid getting preg or if you want to then you would have a better idea of when you would have conceived so you can predict due date.
Of course the FF is a great site to help you start charting.
Good Luck to you!
-Nicole