Can you ovulate then start your period the same day?'m

Hi everyone I'm new on here and kinda new to the opk testing now since our 4/23 m/c has d&c 4/28 stopped bleeding 5/2 went to doc 5/5 everything good after then put nuva ring in 5/5 took it out for my first after post m/c now on 6/3 or had lots of pelvic pain and discharge like when I ovulate so took an opk and was not positive completely but was darker but then on 6/4 took one afternoon and one pm and both got darker then 6/5 I took afternoon and pm and they were even darker pm was equal to the control line so I was excited then like two hours later I started bleeding and even on 6/6 I got a positive opk I was on for my normal six days and after that on 6/9 10 11 was next time I tested and was back to normal negative opk what could all this mean sorry so long really looking for answers thanks in advance.