Possibly after loss ?

Possibly pregnant after a loss at 4 weeks... The hcg only took a few days to get out of my system because my levels were already low when I tested I got a very faint positive after that negatives and I believe I conceived after that when can I test?I had bleeding on 3/3 but I believe I ovulated early CD 6 or 7 now CD 12 been having same symptoms before my loss backache,cramps,gassy,nauseous and headaches... Some people are saying it's too early to have symptoms,what  do you ladies think ?