Feeling left out at work

[Thisisthebeginning]

Luckily I'm only here once per week (I have other work outside of this) working with 2 females and I'd say we're roughly in the same age category, I haven't asked.
I'd met the other woman once last week and today we've got somebody new who started. (I only recently started myself)
I've just felt like they talk between themselves more rather than talk to me. When I walked in the new woman didn't say a word to me until I spoke to her, which is fine, maybe she's nervous or shy. However I noticed she was more chatty to the other woman even though they'd also just met.

The conversation is very mundane, talking about the weather, traffic, xmas plans. So it's not like something niche that I can't be part of.
These things happen sometimes I guess. How do you integrate into groups like this? Or shall I just ignore them since I'm only here once per week? Cliques and workplace politics are all over sadly

you a) recently started and b) are only there once a week and c) have no idea if they know each other out of work?

Just do your job, and if you don't like it quit? or how about coming in with a smile and a "good morning, how was your week?"

If they are in the office together more this is totally normal.

Maybe you give off a cold or awkward vibe that makes you hard to involve in conversation?

Are you actually attempting to join in or just watching?

They also only just met too, and don't seem to know each other outside judging by questions.
I have asked questions, asked how was your week as it happens.
I can be shy, but I am smiley and polite. Maybe I do give off a vibe though?

How is it a clique or politics if you've all just met.

Make an effort to be friendly and chatty. Think about what vibe you are giving off.

I am joining conversation and smiling, listening etc. I dunno, maybe I just look awkward?

You sau you are only there once a week. Is that also true for them? If they spend more days togther it would be quite natural to have built up a bit more of a chat, even if quite new. Can you perhaps initiate some conversation or chats rather than smiling and listening - that can be read as being shy or nervous and perhaps they feel they don't want to be pushy.