So my period is not due until Thursday however I have tested between yesterday and today and 2 very faint lines . One on a blue dye and other on a pink dye then this evening I took an additional test and it came up negative. Has this happened to anyone else ? My lines should be darker know being as thought my period is due on Thursday. I am thinking chemical pregnancy.

UPDATE:

I got my period on that Thursday and it seemed like a regular period however after it went off something told me to test again which I did and got a positive and then took another one within minutes of the first one and received a negative. This is so weird and has never happened before. Did that happen to anybody before ?