Im Terrified !! 😔😭😩

So back in april I lost my baby girl due to a missed miscarriage at 16 weeks. Im currently 9+3 weeks pregnant again and went for an early scan at 8 weeks and saw heartbeat and baby, everything seemed fine. Why am I worrying tho? I just get scared when im not feeling as sick as i did 1 month ago, there is no way of being sure baby is fine. My sickness hasn’t gone completely its just eased off abit 😔should i worry??