pink light period am i pregnant

so my partner and i don’t use condoms, so he only pulls out bc i’m not on birth control either( i know i’m stupid i’m already learning my lesson) but for the first time ever i have the lightest period. the first two days i didn’t bleed enough to bleed through tampons which usually happens. but on the third day i had my normal flow for a couple hours. according to my research spotting/pink blood can be a sign of pregnancy. i had all my period symptoms but people have told me u can get a “false period” with period like symptoms but for like 2 days. this scares me because i only bleed normal once and i’m on day 4. i’m in my teenage years, so other people tell me it can be stress related, but i’ve been more stressed than i am now and my period was never this light. someone please help!!