Missed period but protected

Kaitlyn

Okay so I have the nexplanon implantation, and I use double protection but the nexplanon is still fairly new so I’m still adjusting. I had one period so far within 3 months that I’ve had it. I’ve missed 2 periods. I’ve gained 7 pounds since the last month and I’m kinda worried but I can’t get a test easily? Any suggestions?