help :(

i’m super worried because if i think about it there is a very slight chance i am pregnant but i’m not on birth control and the only time me and my boyfriend had sex without a condom was over a month ago but now i’m closer to my period and tomorrow starts me being late i’m noticing things like my tender breasts ( they usually are during my period) i had some trouble pooping earlier this week and i’ve always had little stretch marks on my hips but on one side they look more defined, but i really know i’m not but i literally overthink everything so positive comments helping me would really