Is it too late?

Christine
So I completely missed my period for this month. But everything I take a test they are either negative or defective. I also have pcos and hypothyroid which I have heard can make your hcg low even in early pregnancy. I have had some symptoms that I don't usually have heartburn/indigestion, mood swings, and every time I eat pork I throw up. Am I out or should I keep testing?