I am a 43 year old woman who normally has a 21 day cycle. this month is 18. am i pregnant?

Pregnant?: Not sure, but you must see your Gynecologist as soon as possible! Hope all goes well!

Yes: If you think you might be pregnant check then check a home pregnancy test. They are cheap, reliable and available at any pharmacy. A shorter cycle is not typically a sign of pregnancy. A 3 day variation in cycle duration is not particularly atypical. There are many options to help with menstrual cycle control. An obgyn can walk you through the options.