1 baby 3 miscarriages and now pregnant!

Okay so I have a healthy 3 year old boy. . Than Miscarried 3 times. . I just found out I'm pregnant and I'm scared for this pregnancy. Everyday, every minute every sec of the day since I found out. . I could not rest my mind. I am constantly googling. I'm scared it's going to happen again. I want to prepare myself. It never works, btw. But I just want to get some answers. Some support. Some assurance! So supposedly from the ER and clinic, my results for blood work is I am somewhere along 3 weeks? But someone on here says with my hormone level (1019.0) I seem to be 4 weeks... All day today I have been short of breath.. tiny cramps.... barely ate. .. And now I'm lying in bed doing nothing and still shortness of breath?! Also I can't even get comfortable as if I'm 9 months pregnant! WHAT IS WRONG WITH ME!