Might want to retest if symptoms persist. I have read in our paper that some have initially tested negative and then test positive. I looked online to see if they were saying the same thing and they are:
Rapid Swine Flu Test Misses Many Infections: MedlinePlus I think the rapid test is only valid if you get a positive. A negative does not absolutely mean a negative.
Sorry to hear so many in your fqmily are fighting illness. Saying a prayer you all recover quickly!