Thanks for writing in.
Having your periods twice a month is abnormal and needs to be looked into. Most commonly, it occurs due to anovulatory cycles. It is extremely unlikely that you have conceived since ovulation is not taking place. If you usually get your period once a month at a particular date, then you should be expecting it again at that time. If you miss this period, then do a urine pregnancy
test 1 week afterwards.
If this thing ( getting period twice/ missing periods without conceiving) repeats, please see a physician. We'd need to get an ultrasound
to make sure everything's fine.
hope this helps