Firstly, you did not say if you are on any type of contraception
and if you are having regular cycles and when your last date was. Your diagnosis of pregnancy
should first be established by a blood test
as urine tests are not sensitive to detect the low levels of the hormone as seen in early days many-a-time. You can also get a sonogram done to detect the sac if your period of amenorrhoea is around 5 weeks. The cause of your cramps should be established, if it is related to your being pregnant or something else. I advice you to see a gynecologist to get the above things done and get a proper advice. Without all this, taking Duphaston
on an empirical basis is not advisable. Good luck.