Is spotting resulting from a decrease in the effectiveness of contraception by an antibiotic synonymous with unblocking ovulation?

Good morning, I have a question. At the beginning of the blister of contraceptive pills for 3 days I took an antibiotic and after bleeding from withdrawal (it starts with 1 tablet from a new blister) immediately appeared spotting (mucus with blood) - I wrote with this topic already here and I got an answer that these spotting may result from a decrease in the effectiveness of the pills as well as an infection, which I also struggled with. I take the pills for 9 months and for the first time I took an antibiotic and my question is whether if these spotting were the result of a decrease in effectiveness, is it synonymous with unblocking ovulation? For the period of taking the antibiotic I did not have intercourse, then I used condoms and unprotected intercourse was after about 15 days from finishing the antibiotic, but I feel some stress whether I really did everything right :) Best regards