Spotting @ 5w3days, 2 previous miscarriages

Ashley • Mom of a 5 yr old. TTC # 2 for 4 years. 3 miscarriages (1 before and 2 after DS). D&C’s with all three miscarriages + 1 @ 2.5 weeks post delivery due to a delayed PP Hemorrhage. 31 years old w/ very low ovarian reserve. 2 failed IUI’s (discovered hubby ha
I am currently 5 weeks 3 days pregnant (according to my last period). 
This is my 4th pregnancy; 1 Son and two previous miscarriages (both of which I needed D&Cs)
I got my HCG done very early @ 4 weeks, it was 74.  4 days following that it went up to 365 and then 4 days past that (5 week & 1 day) it went up to 1400.
This evening when I went to the washroom I had a brown and pink/reddish tinge. I am so worried because I bled with my other two miscarriages. 
Has anyone had a similar situation and had a healthy baby? Or been through something similar? What are you thoughts?