Symptoms

I am irregular. I was sexually active with my husband while ovulating three weeks ago. I have been feeling extremely exhausted, sleepy, horrible lower back aches and some small cramping along with some pelvic discomfort. I did get my period, however, for three days over a week ago. Didn’t last long and wasn’t much. I heard woman can get pregnant even if period comes especially in the beginning of pregnancy. I am wondering if anyone has any opinions or advice. We want to get pregnant so much. I want to take a pregnancy test but I don’t want to get let down. Also is it too early? If someone can help me out that would be great. Thank you so much.