Advice

So i started what i thought was period last thursday the 21st. I typically bleed pretty heavy. This period was about a medium flow. And through out the 3 days i was on it , it woukd srop sometimes for 6-8 hours and start up again. I didnt use nearly the amount of tampons or pads that i typically due every month. It also ended early. It stopped the 23rd in the evening. I havent bled at all since until a few hours ago. I had that "gush" sensation and went to the bathroom . When i wiped there was light pink on the tissue but not enough to amount to anything or need girly items. I have since went to the restroom and no more spotting at all. My breasts have been tender for about 3 weeks now. Ive taken 2 tests, one yesterday morning and one last week a few days before my period was due. Both negative. When i go to my logs, we have unprotected sex the 10th and 16th of feburary. Could this possibly be implantation bleeding? Am i losing my ever loving mind!? Im so confused with what is happening to my body. My periods have always been heavy all my life. I havent been on birth control of any sort for 2.5 years. Stress levels have been super great so idk how i could play it off as stress.

Heres my two prior tests.

How long do i wait to test?