I am a diabetic, type 1.my last period was in november,i did do a home pregnant test in december but was negative.till today 13 march there is nothing. can i be pregnant or is there something else?

Tests are accurate: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after 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.