Irregular periods, had last period on 6/5, today got negative results in first response

Abi
Hi all,
I am in TTC for more than 10months. I usually hav irregular periods because I have PCOS. My cycle length will be long. Today I took pregnancy test and the result was negative. It's been 45days since I got my last period. There is no symptoms for me to get my period. So I m totally confused. Want to know whether there will be a chance of getting pregnant if I take a pregnancy test after 50days from my last period? Is there any possibilities?