nervous new mommy-update

so this is my 1st pregnancy, I'm 31 and me and my ex tried for 5 years with no luck before he left me. now I'm six weeks pregnant by a man I adore and very excited but nervous. 5 days ago a spotted in the morning, this happened for 2 days. went to the dr and found out I was pregnant with twins. didnt spot for 3 days. then today woke up and started spotting again. no pain unless I cough. I'm just worried about loosing my babies. I just need some reassurance. I have noticed the mornings I am spotting, I wake up sleeping on my stomach but I'm only 6 weeks pregnant and I dont feel like laying on my stomach should cause any harm this early. I just need some advice.

got my second ultrasound today. had been spotting off and on for 2 weeks. Dr notified me today that baby A looks good and is right on track with a healthy fur of 173. however, baby B is much smaller and has no heartbeat. I'm loosing my second baby. prayers that my miracle baby A stays healthy and growing. follow up ultrasound in 2 weeks.