Negative pregnancy test and no period

Hi guys.so 2 months ago I went to my gynecologist and I had a hormonal imbalance he treated it and tested me again after the treatment my hormones was back to place again he then gave me the letrozole I ovulated om the 18th I was surposed to start my period yesterday which makes my period 2 days late today I tested this morning with 2 tests a clearblue and a cheap 1 and both cane back negative.is it a possiblety I can still be pregnant as I read om the internet a pregnancy test can’t be wrong the day of expected period I have all the symptoms tender breast,fatigue,nausea everything