Urm, so u had a period 11 days ago? Am I rite? Was it any different? Was u TTC sorry I should of looked back at what u said before. Maybe u just had a kinda like fake period, and maybe ur 2 months preg? I think u should go to the dr and get some bloods done. They may even get u an US? All the best I hope it really is a BFP for a new baby here now!!
The pregnancy hormone (HCG) can stay in your system for weeks after a miscarriage, which would result in a +++ test. It depends how far along you were (the further along, the higher the preg hormone).
You'd need a blood test to check HCG levels to see if they are high or low, wich would determine a m/c or not. (Or a vaginal U/S).