a reason to worry??

After what I thought may be implantation bleeding that was so light I barely noticed it only after I wiped from pee.... I decided to tAke a pregnancy test. The result was negative and I left it on the back of the toilet 🚽 I glanced it hours later and  saw that an incompetent but very noticeable blue positive line had appeared. Of course, this prompts me to take one just to be clear this morning and with a digital test the result says NO. Now here I am thinking I'm definitely not pregnant and I had thAt very strange barely there bleeding for 2 days. If that WAS my period should I be concerned that something is way off with my health?