TOOK THE PREG TEST TWICE(NEGATIVE) BUT STILL DELAYED 2 MONTHS.IS IT POSSIBLE THAT I AM PREGNANT?

im 25 yrs old.we had unprotected sex on may 1st..i am expecting my period on may 7th onwards(im irregular{usually 30-35days),im almost 2months delayed.i took home preg test twice and came out negative.ive gained weight,lil bit lazy waking up,easily get tired, but i do not experience vomiting..i did took hpt first urine in the morning. is it possible that some home test kit are probably not accurate?is it possible that i am pregnant? does anyone experienced this? please answer.. thank you so much..