You can get a blood test
done for pregnancy
if you definitely want to rule it out, as they can give you a result from 3 weeks onward after the last period . Your doctor should be able to tell your pregnancy by a physical exam at around 1-2 weeks after the missed period. Do not start the fertility
drugs now before ruling out pregnancy. You can get a routine urine exam, and a sonogram of the uterus
and adnexae. there should be no confusion, just wait for a few more days and follow the instructions of your doctor. Wish you good health.