Confusion and Hope - BFP or just left over hcg

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I lost my twin daughters on Sept 29th and bleed consecutively for almost 3 weeks. My fiance said i was acting like i do when i first get pregnant and thought to my self that was impossible i just said goodbye to my girls a month or so ago. So i tested yesterday and swore i saw a faint line so i decided to test again today on 2 different tests and now im confused could it be left over hormones from my twins or am i pregnant again?