???could it be???

Okay ive been trying to concieve for 2 yrs now prior to that i had two miscarriages...all I ever get is BFN'S well now im 4 days late for AF and have very tender nipples cramps every so often not bad. Could it be?? Am I possibly pregant ive tested twice both cheap tests (because ttc for 2 years and buying good tests you can only imagine the amount of money ive spent) and both negative dont no what to think or do I dont wanna get my hopes up too much