Periods whilst on implant?

Patient: Hello, I’m a 16 year old girl, I have had the implant Nexplanon coming up to two years on the 22nd of Feb, I have recently been bleeding, from light to heavy flow. I am sexually active and have been with my boyfriend for 3 months on the second of April. My boobs have become really sensitive or sore and I have a headache every now and then. Does this mean I’m pregnant or my contraceptive method has stopped working? Thanks

Symptoms: Periods or bleeding?, Headaches