Help!

Okay guys I need help cause my boyfriend and I are currently ttc we've been trying for 6 months and still no luck. I had my period 3 weeks ago. My normal period. Well yesterday I noticed every time I wiped it was brownish stuff on the toilet paper I figured it was just old blood. Well as the day went on it started turning pink. It stayed pink all day and today it's still happening but not that bad. Can somebody please tell me what it could be?! Please