is my ex checking up on me?

[.:ant0ni0:.]

Ok, so we pretty much stop talking about two years ago and now she's with somebody else that I know, she's preganant and is due next month and I heard they got married. .. but anyways I posted a pic on my FB yesterday and her sister liked it (sister that I don't have as a friend and nvr really met) so I'm curious why would she do it? I forgot my page is not private. .... should I just ignore it? It seems weird to me that my ex or her sister would do this

[Sam]

Yes

[Georgie]

She's your ex for a reason. If she married and going to have a baby, why are you still interested in her?