I think my poor girl might be sick. Last night she screamed and cried until she puked and fell…

I think my poor girl might be sick. Last night she screamed and cried until she puked and fell asleep not too long after and seemed better. But right when I got up to feed her she puked just a little and it was yellowish. The she did it two more times within an hour. She's only a month old so I have no idea what could be wrong 😞