Conceived the day of my mirena removal? HALP

Two weeks ago I had my mirena removed after experiencing some God awful pain for months. I didn't plan to remove it but my Doctor said it had to go. I had sex with my s.o pretty much every day prior to the removal. I didn't bleed or anything after having it removed. It's been 11 days post removal and I have had light brown spotting for the past two days. It was gone by this morning. I had light cramping yesterday and the day before. I am DOG tired, nauseous ( threw up a little this morning after breakfast) and my lower back is just uncomfortable. I took a test this morning but it was negative. I feel like im going crazy. Is it even possible to be pregnant??