Spotting but no period

So I was supposed to get my period some time last week. I am on the mirena and didn’t get my period for the first 6 months but have had it regularly for the past two years. I had some light brown spotting for two days and then nothing. I’ve noticed I’ve felt sick when drinking the last two weeks. That’s what happened when I was pregnant with my son also. I took a pregnancy test and it told me to look at the instructions. I’m planning on getting another one tonight. I just thought I’d see what you guys thought.