So confused, help if you can :(

Chenise
Hello :), I ovulated as usual, then bled for four days (abnormal but put down to ovulation or very early implantation?), then got two faint positives, then started testing negative. 
Obviously I understood that I had a chemical pregnancy. But I'm now 2 going on 3 days late for my period. 
Have been ttc for two years, with one miscarriage at 5w3 in October. 
Looking for advice, can't find anything on Internet x