Freaking out...

Woke up this morning with brown spotting AGAIN.. It quit for like a week.. I'm not 5 weeks and 3 days.. Isn't that way past implantation bleeding? That's what every one keeps saying it is... But this doesn't look like that.. It's dark brown, kinda thick.. I'm really scared.. I've has six miscarriages and I don't wanna have another..just saw my doctor the other day, the took blood for levels.. Supposed to have an ultrasound on Monday and more blood levels.. But I don't know if I'll even make it till then.. People keep telling me not to stress and to relax.. That's kinda impossible at this moment..