Could The Periods Be Due To An Implantation Bleeding?

hi my name is shay i have been having abnormal menstruals for the last 3 months on june 16 i had unproteced sex a day b4 i usually come on my menstrual i came on the next day i stayed on for 2 days which real abnormal my menstual was a lite red and the couple of wks after that my breast started to feel full sensitve tender in july on the 17 i came on my menstrual i was on for 2 days again i was supper lite like i was spottingan it was a brite red i started to get nuease my stomach started to hurt real bad i started2 get lowr bak pains and side pan iget real dizzy and lighheaded i lost weight due to the fact i dont have an apptiet and wen i do have one i eat i get sick but i dont vomit i get real tired just from walking to the mailbox iget real emotional i cry a lot i crave for crazy food do u think im pregant could i be pregant are the periods i have been having is implantion bleedin iwanna knw b4 go to an clinic