Birth control

Hi girls! I just stopped taking my oral contraceptives, I was on them for around 1 year and 9 month. I was wondering if I may have ovulated earlier than excepted. Luckily my cycle was right on track when I stopped taking my pills. I got off the pill on June 7th and was still on my period. I felt myself start to “ovulate” and had EWCM around the 18th and took a opk which was positive on the 19th which is when I BD. Could I have fallen pregnant earlier than excepted if so when should I test ? Answers please thank you!