Could I be pregnant? Thoughts?

Okay so my boyfriend and I had unprotected sex March 12th and 13th then I had extremely light bleeding on March 19th through 23rd. I've had cramping, nausea, heart burn, moodiness, darkened nipples, craving milk (I never drink milk), discharge that's not normal for me, and I'm being extra clingy to my boyfriend. Could I be pregnant?