Early pregnancy symptoms

Hey guys so i had intercourse the 3rd 9th and the 11th and today is the 14th so 2 days ago i noticed pink blood when i wiped only a little and only when i wiped 2 days later i started spotting very light off and on all day and it changed colors one time brownish next pinkish I’ve experienced spotting off and on for 2ish days maybe even less but very light and not getting heavier at all just spotting so the other night i had a really bad headache it was so bad it made me really nauseous and shakey next morning felt perfectly fine is this early signs of pregnancy??? Does this sound like implantation Bleeding and what was the first sign of pregnancy for everyone else let me know (also i would appreciate it if there was no negative comments telling me I’m definitely not pregnant because it makes me emotional) lol thanks