Advice!

Hi guys! Looking for some advice! Went of BC in January and started TTC right away. I've had normal cycles since until this month. My cycle was expected on Thursday 19th. Nothing showed. I tested and it was negative. Friday 20th I had light spotting only when I wiped, slightly pink and a little brown. Today, so far, it seems as though it's gone. What to do??? First time TTC, Young, and nervous!! Thank you!