Help! 😫

Ca

11dpo. LP is typically 15 days (sometimes 14 or 16 but average of 15). Having some mild right side cramping and just had brown discharge (small amount) in my underwear and when I wiped. AF not due until Sunday. I do often get a day of brownish discharge a day before AF but this seems early. Here is my chart, no temp drop either. Could I be pregnant (implantation bleeding)? Should I wait to test?