Implantation?

Jessica • TTC # 1
On 04/01 I thought I started my period. I had light spotting pink/brown. 2 days before that I had some light brown spotting. I also had some light cramps, nothing like my regular period. Yesterday 04/03 it has completely stopped. I have not been on birth control in almost 5 months and even when I came off of them all my periods have been regular. Should I test? AF was due on 04\01 so I just assumed that was it. The spotting started 16 dpo.