I've had an iud for the last 3 years, my period has lengthened & became regular. i've just missed my period for the first time since, my period is more than a week late & i've taken 2 pregnancy tests. should i be worried? i am tired, have cramps &

Tests are accurate: Today's home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test will give a reliable result 3 weeks after sex (or when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.