Really long weird question

So I got nexplanon inserted about two months ago, about a week ago I was experiencing pregnancy symptoms that I’ve had only while I was pregnant with my two kids. I had slight cramps, nausea, and some other things. After being 4 days late for my period I got a very faint positive on a Walmart cheapie but took a couple dollar tree tests and they were negative.. I was 6 days late for my period but I eventually got it.. could I possibly be pregnant but this birth control could just make me have irregular bleeding that I think is a period? I haven’t tested since I started but is there any reason to test? Thanks guys