BFP. *possible TMI*

Well, we got our BFP after a mc on Dec 22nd, and a d&e on Dec 23rd. Accoding to lmp and babybump pro (the app I'm using along with glows partner nurture app) says I'm 4 weeks, my breast hurt a little, not to bad, and I've had minor episodes of morning sickness .. Just nausea tho. & I seem to be having some cramping, but it also seems that a bowel movement eases or even stops the cramping.. I'm terrified, and over thinking everything, and as much as I realize that I can't help but think this will be another loss... Any words of advice?