Hi, I'm 20 yrs old and I'm wondering if this is normal or not...in december I got sick with the flu and I didn't get my period that entire month and ever since my period has been weird I didn't get my period until Jan.1st to 3rd and the month after it was late and it's been like that for the past months up to now which again I didn't get my period for the month of may until this Friday. Should I be worried? *note: I was on the patch for 2month 2years ago.