I had 1-good 8 cell embi and 1-ok 10 cell embi transfer 10 days ago. I initially had a lot of cramping but that subsided around day 5, my progesterone was taken day 6 and it was low (8.1), they upped the dosage! today I started having strong period like symptoms, headache, cramps, and brown spotting (not a lot). Today is day 10 is this a loss or does implantation happen this late in the game. Day 13 is my hcg test! Thanks!