Nexplanon and pregnancy

Sydney

So back in January I got the nexplanon inserted and had two periods after, the end of January and February but not in March or April. Now I know that the this BC can cause you to not have periods or irregular periods, but I’m concerned I may be pregnant. I’ve had tender breasts, nausea, frequently using the bathroom, slight cramping, all the pregnancy signs and even what I though was flutters over the past few weeks. During this time I’ve also taken 4 pregnancy and they have all come back negative. Is it possible the BC is giving me a false negative or am I just completely crazy. Ladies please let me know what you think and if this has happened to you.