I am on clomid 150 mg. I had my last period on December 6 ovulated 19-21 and had sex 17-21. I was having a bit of nausea the week I was due for my period. Jan 6th which is 31 days after my last period. I am very regular 28 day cycle. The day I got my "period" on Jan. 6th it only lasted for about 8 hours then had spotting not even enough to fill a lite day tampon for that night and in the morning. I took a test 4 days after that period and it was negative. Could I still be pregnant