Help??

I currently have nexplanon in my arm but I am overweight and have heard that it can be defective if overweight. I have had a normal period until March. I am currently 19 days late and am experiencing some pregnancy symptoms. I have been super moody (more than normal), sore boobs, backache, acne, fatigue, etc. I started spotting yesterday but not enough for a period. If I am pregnant, this would be my 2nd pregnancy. With my first I didn’t know I was pregnant until 11ish weeks because I didn’t really experience any symptoms and I also didn’t know what to look for then. Also with my first, I took a pregnancy test at about a month and it was negative even though I was actually pregnant. I have recently taken a couple of cheap tests and they were negative. Is it possible that I am pregnant and just don’t have low hormones? I am not actively trying but wouldn’t mind another baby. Any advice would be appreciated. 😊😊