I’m concerned

I know it’s highly impossible, but I have Nexplanon in my arm but I think I might be pregnant. I felt really weird for a while before I even considered the fact that I might be pregnant. A little over a week ago is when I started thinking that I might be. I had light cramping off and on for 2 days. I spotted very light pink during those two days. I was constipated for days and days to the point where I had hemroids. I started drinking coffee to make myself go though. I’ve had a constant headache for about a week now. No matter how much I do or do not sleep I’m absolutely exhausted! Getting through work has been such a struggle. I’m emotional and moody. I am a pretty calm and nice person but I cried twice today while out with my boyfriend and his mom. Over the past few days ive cried and I’ve gotten irrationally angry. I’m peeing every 2 hours. I’m having very vivid dreams, weird dreams at that. My lower back is in so much pain and nothing helps any of this. The sheer thought that I could be pregnant on this birth control terrifies me. Scares me that there could be something wrong or that it wouldnt survive. I honestly am trying not to think too much in to this, when I was married I was TTC for 5 years and nothing so like really what are the chances. I’ve just never have felt this way before. I’m still trying to pick up the pieces of my life after a divorce. And I raise my 12 year old sister. I took two tests. I saw a faint line on one and nothing on the other. But they were blue dye so who knows. I know I need to buy more I’m just so scared..