There are several ways to diagnose pregnancy:
A quick pregnancy test
A method to find out whether you are pregnant or not at home with a quick test, noting that in these tests there is always the option of a false positive or false negative result.
They function on the principle of detection of Beta HCG (human chorionic gonadotropin) in urine. Increased HCG means a positive result. Usually they are done at the first urination, in the morning because the concentration of HCG hormone is the highest in the morning, so it is easiest to detect.
The sooner you do the test, the more likely you get a wrong negative result, i.e. the test shows that you are not pregnant when you are actually.
Regarding the time to be done ie when the earliest possible pregnancy can be proven with the rapid test, it is considered that it should take at least one week from the delay in the menstrual cycle.
The blood test procedure is a much more accurate and reliable method than the quick test. This procedure is carried out in a laboratory and works just like the principle of HCG hormone dehydration. If there is a concentration of quantity above the reference values then it is pregnancy.
The safest way to determine pregnancy is echo diagnostics. With an echo device, a special probe connected to a monitor determines pregnancy. Pregnancy can be seen on your own monitor, which is also seen by the embryo and its further progress.