My daughter stopped taking the pill and is trying to become pregnant. she's been having unprotected sex and has a light spotting of blood ?

Follow up: I'm not exactly sure of the question asked. If you think she may be pregnant have her take a home pregnancy test. She could also be having spotting due to not taking her birth control due to the hormones. Following up with a GYN or family doctor is recommended.

That in itself: is not really suggestive of pregnancy. How long has she been off the pill? She should monitor herself and do a pregnancy test a couple of days after her expected period.