Spotting 10-12 days post-ovulation, period 2 days late, but test shows up neg?

HELPPP! I have a very regular cycle. NEVER in my life have I ever spotted and I went through about 3 days of light spotting starting 4 days before my cycle was due. I am currently 2 days late on my period but all home tests show negative... could I still be pregnant? Has anyone gone through this then later found out they were false negatives? Thanks in advance!!