I'm ttc, cd 18. had brown spotting cd15-16, red spotting cd 17, light-moderate bleeding today. what are likely explanations? when should i see a doc?

Spotting: Spotting is one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections, polyps, fibroids and hormonal changes can cause spotting. There are many options available to help regulate the menstrual cycle. Schedule a visit if the problem continues.