Sorry for what has happened to you. One mc is hard enough, never mind all that you have had.
How late ovulation happens doesn't have much of an effect in general. However, if you have low progesterone it can make your leutal phase short and that can cause early mc. If you record your OV and AF have a look and see how long your leutal phase is, it should be between 10 and 14 days. Any less than 10 days can mean that the bean isn't sticking strongly enough. However, try not to stress as general low progesterone is one of the easiest things to deal with.
If you are worried you can go and see your GP and ask for your hormones to be tested.
Good luck honey xxx