Implantation bleeding ?

Hi all! First post here. My husband and I are going to start actively trying in October but currently are doing the “trying not trying”. I’m 5DPO according to the tracker although I can’t be 100% certain which day I ovulated. We BD three times in my fertile window. Anyways today I was going to the bathroom and when I wiped I had a small (dime sized) light pink bloody mucus on the toilet paper. When I wiped again there was nothing and it hasn’t happened again. Could this be implantation bleeding?? I never had with my first born. Thanks!!