Has anyone ever had 2 faint positive test after fmu and then a following 2 negatives in the evenings?

Melissa
The two very faint positive are hard to see but they are there (one cheapie one walmart brand) and then I took 2 tonight (one cheapie and a clear blue digital) and they came out negative. It is 5 days before my period. Can it be a chemical pregnancy or a possibility I am pregnant but it is early?