My last period was January 20-26th. I'm suppose to come on the 21st of February due to my calendar. Today the 17th I've experience brownish blood right after sex . As I whipped my self I began to see brownish red I put in a tampon when I took it out It was pinkish brownish blood and same when I whipe very light pink/brown blood. Don't kno what's wrong or if I'm pregnant and should I test. No symptoms really just slight cramps stomach and back pain help please