Miscarriage then conceived

Have any of yall had a misscarriage and the  got pregnant before your first period? I delivered my daughter at 18 weeks placenta and all on dec 20th 2014...i have yet to have a period and my partner and i bave been ttc since january 1st... I have headaches,nose bleeds,indegestion and so sleepy but thats normal for me lol. I took 4 first response tests at different times and got 2 faint positives and 2 negatives. And i took a cheapo test today and got another faint bfp. But kinda looks like a evap... What should i do and when can i expect my period or how hard is it really to conceive... Btw it was a cord accident :( pathology report shows it was just an act of god:(