Got my period 3weeks ago , began to spot brown a week after some brown slight red ,now this week i am cramping could i be pregnant..should i c a doc?

Take a test: It's possible you're pregnant. If you conceived more than about 2 weeks ago, then an over the counter pregnancy test should be adequate. If the test is negative then you could wait a week and take another, or go see your doctor for a blood test. Cramping can be a sign of pregnancy, a cyst, or a premenstrual symptom, it's very non specific. If your pain becomes severe, go to an emergency room.