Ipill effect. Visit a gynec in person.

My last period was on 6th August , lasted for 5 days. On 18th august i took ipill ( i didn't have sex but some semen might have entered in my vagina while being fingered,so to be safe i took ipill within 24 hours ). I got some brownish bleeding on 1st sept ( 14 days later after taking ipill) and it lasted 2-3 days ,very mild and with clots basically. Today is oct 3 and I haven't got my periods yet and it's been more than my month after i got that bleeding on 1st sept becuz of that pill,i assume it was withdrawal bleeding I took home pregnancy test 3 times ( 2 times after my missed period and 1 yesterday) All of them came negative . But I am worried since it's been too long Please can you tell me when can i expect my periods and after what time if I still don't get my periods i should visit a gynec in person.