6 Weeks Preggy

Hi mommies! I want to ask something. Has anyone here tried/had low lying gestational sac? I had positive PT at 4 weeks and my doctor asked me to come back the next week. Come next weekend, my ultrasound showed I am 5 weeks and 4 days already by the size and image seen. But her concern is the gestational sac is lying low. She prescribed some medications and bedrest for 2 weeks before going back to her for ultrasound. Worried ako sa sitwasyon ko. May nakatry na ba nito? Nagbasa ako sa google about this pero hindi maganda nababasa ko. Natatakot po ako. ?