I had an arm implant inserted, condom broke, pharmacy reassured us that I wouldn’t be pregnant?

Hello there – Im a 29 year old female and back in march I had the arm implant inserted and didn’t get my period that month.
At the end of April, my period started last Thursday and its still going… I was wondering if this alright if its this long as I haven’t experienced it before or its because I didn’t have a period last month?
Also last Friday, me and my partner had an accident where the condom split but we visited the pharmacy who reassured us that I wouldn’t be pregnant even though I was on my period and the implant…
And today, it seems my stomach is heavy and I feel sick so Im not sure if its due to the period/implant or pregnancy