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I'm not sure why you would want to. If you just had your period it's extremely unlikely that you are pregnant. It's very rare to ovulate during your period and it's equally rare to get your period while you are pregnant. As a general rule, if you got your period, you are not pregnant. Try using ovulation tests to find out when you actually ovulate. You'll have better chance of getting pregnant if you use them.
If you get your period, you are not pregnant (with some extremely rare exceptions applying). To take a pregnancy test while you are on your period would be a waste. If you can, use the home ovulation tests so that you can find out exactly when you are ovulating. This will increase the chances thactually get pregnant.