Would like abit of friendly advice about my staffy?

i ave already asked this question but got alot of funny replys instead of help. i bred my dog 4 wks ago & took her 2 the vets both times afta she ad mated & was told its about 20 days afta they can tell if she is pregnant. i am takin her bk 2 the vets next wk but until i do are there any signs i would b able 2 c that would say she is pregnant? she is eatin alot more than usual which i no can b a sign. i am not a BYB & am not breedin her 4 the money as i ave been told. i just want a lil bit of extra friendly advice.