Hello I Was Due In My Period On The 17th

Hello I was due in my period on the 17th a week ago today 2 weeks previous to this I took a levonelle morning after pill and had a period cause by the pill as expected and 5 days before my due period date I took an Ellaone .. after being 4 days late I took a pregnancy test and it was negative but a week later im still not on my period ... im confused and what should I do ???