Implantation or period

[Jfass]

                  
I had sex two and a half weeks ago, my boyfriend and I had sex. I started my period Tuesday but then it stopped. I took a pregnancy test the day my period stopped it showed negative. And my period started again yesterday. I tested again this morning and it was also negative. Could I be pretty positive that I am not pregnant?   My period is already starting to lighten.. It was really clotted though.

[remar]

You're very welcome.

[Jfass]

Thank you!!

[remar]

Not all women get implantation bleeding but if it does happen it will happen within 5 days of unprotected sex. It can be very light bleeding that you may not even notice. Or, it just might be on toilet paper when you wipe to lasting a few days. It's almost always very light.
Since you and your boyfriend had sex 2 1/2 weeks ago it's not implantation bleeding. It would have happened within the first week.
I hope this helps.  

[Jfass]

What is the difference between implantation and a period?

[remar]

It does'nt sound like you're pregnant. If you still think you might be wait another week and test again.