Period 2 Months Late, Red Spotting, Negative Tests??

Amber • Infertile and depressed

So my period is (or was) 2 months late- the last day of my last period was November second. I last inseminated on October 14th. My doctor told me not to worry unless it went 6 months with no period, but I had plans to make an appointment in february. On Sunday though, i have some brown spotting- not at all my normal amount, but enough that i throw on a pad and assume it's go time. I'm dry the whole day, not even anymore brown spotting. Monday comes, i have nothing in the morning (4am) but by 10am i have red and a little clot when i wipe. I throw on another pad, because surely it's go time NOW? Not so much. 100 percent dry all day, pad looks brand new. The last pregnancy test I took was last week, but I should have a blazing positive if I am pregnant, as I would be about 9 weeks along, right? I've tried pink tests, blue tests, and digital, and they all are negative. What does any of this mean???