Pregnant after miscarriage in December

I had a missed miscarriage at 9 weeks in Dec... I found out I am pregnant again. I am about 7 weeks. I am so nervous about this. I'm trying to be more calm and think positively but sometimes it's so hard. I had a very early ultrasound last week at 6 weeks and they found the baby and we saw and heard its heartbeat. Things looks good my doc says. Do you think it's unreasonable to ask my doc to do another ultrasound at 10 weeks? Just because the last one passed at 9 weeks? I hope everything goes good this time! I hope the best for all of ladies in this forem as well. Please pray for me and my baby! Prayers to all of you also!!