I had my regular cycle in june. I started the 26th and ended the 2nd of july. I had sex on july 6th... however he did cum inside me but i took a plan b an hour later. we then had sex again on august 22nd but this time we used protection ... i took a pregnancy test on the 31st and that came out negative. However i have been paranoid. my breast are sore and i had back pain but it wasn’t my lower back. my stomach has been feeling kinda weird... is it possible that i could be pregnant ?