Am I screwed?

I was invited to interview two weeks ago and confirmed my availability for the proposed date immediately (10th) HR came back to me and said that the hiring manager is no longer available on the proposed date and suggested a new date (11th) I was not available for this date and suggested a next day (12th) HR came back to me a week later but said hiring manager was available on that date. However I could no longer do the time suggested (I thought they weren't going to get back to me so scheduled something else for that time) HR asked if I could do the following day (13th) but I could not so gave my availability for this Monday The interview has now been confirmed and locked in for today. However I fell terribly disgustingly ill over the weekend and need to reschedule. will this look bad? it is the first time the interview has actually been scheduled for an agreed date but i fear the scheduling conflicts already will leave a bad impression. unfortunately I cannot even power through it my throat is so hoarse and trying to speak kills me UPDATE: they were kind and happy to reschedule!