Dear all... Can someone help me here? I got my BFP (very faint though) at 13 DPO and got a HCG value of 20 in the blood work. My OB says it is positive and has asked me to come for a sonography tomorrow. I will be only 27 days in the cycle and I dont know what is this ultrasound for... Is it safe to have Vaginal ultrasound at 4 weeks? I heard that some people get periods after that? Scary... someone pls help me...