On BC but maybe Pregnant

So I’ve been on my BC since February and haven’t had a period since, but h e been very on time with my BC. Since last Monday night I’ve had light spotting on and off(think it’s implantation bleeding)some pink discharge and brown. I went off my pill on Saturday the 21st to see if I’d start my period and I guess I’ll have my answer. I’ve heard stories of friends being conceived as “pill babies”(being conceived while their mom was on BC) how likely is this to be true? Btw I’m on Daysee BC I tKe a pill every morning.