Can you ovulate with no period?

My cycle us been very irregular since I got off of birth control in October. Like to the point the doctor had me take preparations back in February to get a period and I did and conceived but sadly lost the baby in March. So in May I was on progesterone again and got my period but now in 7 days late and still no period or positive test. So in wondering if I should call the doctor I had a follow up in July but they moved it to August. And would I still be able to concieve without getting a period?