please help

I am a mother of 2 (3years & 14 months) I just got the nexplonan implant less than 2 weeks ago. My period was due Monday and hasn't come (I'm still breastfeeding so they can be irregular). I've been feeling slightly nauseated and mild cramps on and off the past few days. To put my mind at ease I took a test. This was it. With my last 2 pregnancies the line was very much as dark as the control line. This one isn't. I'm freaking out bc I have this inplant in my arm. Do you say this is positive?