Anxiety

I went for my first ultrasound today and they saw the sack but had a hard time seeing the fetus I’m really nervous I’m supposed to be going next week but I’m really nervous cause I’ve dealt with losses before everything has been fine physically I haven’t spotted or anything I think it may be the ultrasound equipment they have cause there ultrasounds look more darker then the ultrasounds I’ve gotten with my first pregnancy when they were doing it I think I saw the tail of the fetus but it was to dark to really be visible I’m just really nerve wracked right now but I don’t wanna stress myself out I’m just scared is it possible anyone her can help give me a peace of mind