Dear hmbn - it is always possible to ovulate even on day 53. This is why women with very irregular periods still get pregnant on their own without fertility drugs from time to time - ovulation can occur once in a while. Having said this, you should get blood testing for progesterone (to see if you have had a delayed ovulation) and a blood pregnancy test. Also, if not recently done you should also have hormone testing for thyroid, prolactin, FSH, estradiol. If you have a lot of facial hair that you are shaving frequently hormone tests for testosterone and DHEA-S should also be considered. The decision to give progesterone should be based on your progesterone level. It is important to understand that progesterone medication will bring on your period but does not make you ovulate. If you want to get pregnant then after taking the progesterone you may need fertility medicine. You might want to consider seeing a reproductive endocrinologist/infertility MD if you want to get pregnant, particularly if the progesterone test you get shows that you have not ovulated. Good luck!
Sounds like you arent ovulating in this cycle. I have very irregular periods too. i am currently under fertility treatment at the moment and have been advised that I may have PCOS. I do not ovulate every cycle and when I do ovulate it is never during a cycle that is longer than 42 days.