What Causes Brown Spotting With Cramps At The Back?

second ivf

i m day 10 after transfer 3 emb 2- 4 cells a-b qualety

1-6 cells c qualetyand have spoting whit cramps star more be painfull . spoting brown black spots cramps from my back to front pai its come ang going.

first ivf cimical preng day 10 havy bleeding

now i take 3 times progest 200 mg each time and domitrium 200 mg

i have did home test still come negative. what i need to do i cry all day