Thanks for your query.
Chances you getting pregnancy
are less but the possibility still exists.
You have to wait for a week after missed periods to get urine pregnancy test done and get positive test result.
since you are supposed to get periods today, I suggest you wait for one week and do urine pregnancy test at home.
I hope I answered your query. I will be available for any followup queries you have.
IVF & Infertility