Ive Had A Lighter Period Than Normal That Lasted For

ive had a lighter period than normal that lasted for 7 days, then I came of had sex on the 3rd day I was off my period then started spotting a few hours after then today's its became very heavy bleeding and strong pains in my pelvic and lower stomach, I'm on the contraception implant, however I've had a early misscarage last year while using the implant and my symptoms are very a like to that, I was wondering if I could have had another early misscarage