Bleeding again

I just cannot seem to get through this pregnancy without something new developing.  I thought I was finally through with the scares, but aparently not.  After three weeks without any spotting, I thought I was finally clear of problems with the placenta.  Aparently not, because right before bed last night, I am spotting bright red blood agin.  It has turned to brown blood today, which I hope is better.  To top it all off, my abdomen is sore -- not crampy, but sore.  I have a feeling that I will be back to the doctor on Monday.  Ugh, I'd just like to have a trouble free pregnancy for once.  The anxiety after the miscarriage is bad enough to deal with. . . I could do without the constant scares inspired by the bleeding.  I think the baby is ok, because she still squirming around ocasionally.  What sucks is this always happens on the weekend too and I am never sure if I should call the doctor.