I could be overthinking

Love

Im asking , did anyone get something they thought was a period before BFP ?

I think I started my period today . It’s not due for 5 more days . It’s not heavy but not super light either . I have no pms symptoms at all except slight back pain . I’ve been having unprotected sex. My periods are never earlier than one day and I have NO new routine in my daily life .

Should I go to the Dr? Could I have endometriosis’