Is white clear watery discharge early signs of pregnancy its a lot , took plan b and have been exercising also took pregnancy test came out negative?

No: If you ovulated around the time of unprotected intercourse and you took Plan B within 72 hours you are hopefully safe. Do a pregnancy test in 4 weeks to be safe. See you doctor to check and make sure you don't have an infection or std and discuss contraception.

Leukorrhea: can increase if you have been exercising a lot. If the pregnancy test was at least 2 weeks after sex - it should be accurate.