Hi, Im Here Because Im Wondering Is It Possible For

Hi, im here because im wondering is it possible for me to be experiencing implantation bleeding and if i could be pregnant. When i was trying to conceive i always had sex during my ovulation but it never worked i think because my periods were irregular, my average cycle days is 29, so me and my partner stopped trying we figured it wouldnt work. We had sex a week before my ovulation(after my period ending) with no protection and he didnt use the pull out method, since my periods are irregular i figured the days i was calculating my ovulation couldnt be correct, i didnt think having sex after my period i could possible be pregnant, this past week my nipples have been really sore but not my boobs, thats normal before af, except i get cramps to let me know that my period is coming, instead on friday January29th when i randomly went to the restroom and wiped it was very light pink spotting on the tissue and ever since ive never seen it again...my period is not due until February 7th (another week) and i know implantation happens a week before expected period, i have been really exhausted lately and sleeping more than usual, and have been eating more(going against my diet), and have been thirsty a lot with sore nipples, is it possible that this was implantation bleeding or could it be something else??