of course it's not her birth control. if it were, it wouldn't have onset randomly for a week straight after months of usage. also, morning sickness typically occurs after the first missed period (which she should notice if she's still getting them regularly) and doesn't work as continuously like that either.
you know what it does sound like though? every other obvious sickness/flu/stomach bug/eating disorder... why are you baby daddys trying to scare babysappyton?