I started my period a week early and it lasted longer than usual i had unprotected sex but he didnt came in me he said it was just pre cum ?

Please clarify and:: I'm not sure what you're asking. If you had sex before your period came you can be sure you're not pregnant now. Periods aren't exact- they can be early or late, esp. in younger and older women. It's important to know that pre-cum often has sperm so it's possible to get pregnant from pre-cum. See https://tinyurl.com/yypxtywy If you want to prevent pregnancy use condoms, diaphragm or the pill...