Pregnant CM?

I have pcos and i dont get regular periods. I recently lost 50 lbs which increases chances of getting pregnant. I first noticed this CM about 15 days after intercourse and its been about a week since it started. I cant go on periods as mine are not regular...ive never experienced this before which is why im thinking pregnant. Took a test yesterday and this morning and they were negative..too early? Im going crazy lol