I took a pregnancy test in Nov. a week or two after my menstrual ended (Nov. 14th - Nov.18th) normally, I get it for three days. But this month had it a little longer. So I took a test a week after because I was still cramping, felt nauseated, tired, boobs hurting all the signs. So it was negative. Then at the end of Nov. went to my OB did an ultrasound not blood test and didn't see anything. Waited until Dec. around 14th and every week after that and no period. Took a pregancy test in beginning of January. Confirmed pregnant and went to see an OB on Jan. 12th, which confirmed I was 8wks6days. So do you think I conceived in Nov. or Dec.??