I have noticed this happens alot. When I am at a club or bar and am talking with a girl alot of the times one or more of her girlfriends will come up and most of the time start whispering to her. When this happens I always feel it is one of her friends telling her to walk away cause i have noticed that when a girls friend approves they just give each other a little look.
Maybe im over thinking it but thought Id ask

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Anyone can be confident with a full head of hair. But a confident bald man - there's your diamond in the rough.
- Larry David

First of girls fill us in a category like resumes, they could have been, they could be telling each other they saw you talking to such and such etc. if you let this effect your mind set it will how physically. they very well could be saying to the friend lets get out of here this place is dead. The look of assurance is generally a good thing but it can also be a bad thing. You cant let it effect your mind set. your worth talking to

secondly pua will say that whispering is bad, smiling glances at each other are good. If they are smiling you are still in period. if they are frowning don't assume your out till they clearly reject you.