My period is 15 days late and had 3 negative pregnancy test??

Zheyan • I`ve been married for a year and trying to get pregnant. Never used birth control pills hoping to be pregnant soon!
My period is 15 days late and I feel very very tired, dizzy spells, bloated, sore breast, headache. Went to my gynecologist and was told I might have PCOS or thyroid issue? Has anyone else experience these symptoms and had a negative pregnancy test? Please share your story! Thank you