Could I be pregnant??

My husband and I have been trying to conceive our first child. About 5-6 days after I ovulated, I had a very small amount of spotting. Since then I have been feeling nauseous almost all day, every day, dizzy spells, and multiple other signals of possible pregnancy. I am still experiencing these symptoms and my period is now 2 days late but I am still getting a negative preg test. Should I keep taking tests or make a doc appt? I am very anxious and want to know! ?