Nexplanon Period

Hey guys

I've had an implant for about 5 years. This is my second one it will be expiring in September of 25. My periods go back and fourth between regular and irregular. I'll have a period as scheduled for three months then I won't have one at all for four months. I'm starting to get worried I'm pregnant because I'm currently 55 days late. I had some light spotting about three weeks ago but that was the end of it. I did take a test 20 days after I had sex and it was negative but it wasnt taken in the morning. I just assumed waiting 20 days after it would be positive at any time of day if I was. I've just noticed my boobs are super sore and I justthey typically aren't before I start my period. Is this normal or should I test again?