M.M.
You may want to take a test and see if you are pregnant now. You can think you are MCing and you are just passing stuff that is not needed or you had twins and lost one but not the other. I found out I was 13 days after O and lost the baby a week later. My body did everything on its own and it did not mess up my cycles. I have had friends that MC and their next cycle was late. You really need to do the test and see if it comes up + cause you could need a D&C because everything did not come out, there is just so much you have to watch for with a MC. On knowing your O time best thing to do is test so you know when you are.