Clear blue says 1-2 weeks preg. irregular periods so assumed not pregnant and may have drank heavily between 14-17 days after conception. now worried.

Not much to worry: about unless you continue to drink heavily. Alcohol has its major effects during the period where organs are being formed, and then later when the brain is maturing (the first one is at 2-6 weeks of pregnancy and the latter in the 3rd trimester. However, if you are a heavy drinker, most cannot stop without help and you should talk to your doctor about a referral for help. Stay quit and good luck