Faint line

I'm freaking out a little, I took an EPT.. Due for AF in 4 days. Showing some symptoms, boobs are super sore and I've had a few waves of nausea. I'm a little worried since it's so light, I will retake one in the morning but I need advice.. I'm worried my little bean won't stick,  This will be my second attempt. I unfortunately miscarried my first time around. Should I call my doctor or wait until my expected AF date?