Implantation bleeding ‼️‼️‼️

Is it possible to be pregnant after having a four day mensural cycle.. but it was much lighter than it usually is? My period was from November 28th-December 1st. Today would be the start of ovulation week for us but we also had sex everyday leading up to my cycle, also everyday since it stopped. Anywho I went to the bathroom and when I wiped the toilet paper was a light pinkish color but it’s 5 days after my cycle could that be implantation bleeding? If anyone can help that’ll be great! Thanks!