Pregnant?

Summer • Hi I`m Summer. 19 years old. I`m married for a year now. Trying for baby number one.
Me and my husband had sex but then didn't for about a week I was late for my period but when I started it only lasted 3 days. It wasnt heavy or light but like medium. TMI but my blood was like a kinda brown color instead of red. I don't have any symptom or cravings and boobs aren't sore. Could  I be pregnant without symptoms?