It wasn't sexual activity that delayed your period--as Smurf already said. So, no, having your boyfriend perform manual sex on you didn't delay your period.
It sounds like the bleeding may have been caused by your boyfriend acidentally scratching you. To prevent scratches, tears, or irritation that can cause pain or bleeding (not to mention increasing your chances of getting an infection), we recommend using a water based lube and latex gloves.
Please read the following articles:
How to use latex gloves during manual sex
Safe, Sound & Sexy – A Safer Sex How-To
"IThe level of our success is limited only by our imagination and no act of kindness, however small, is ever wasted"--Aesop
[This message has been edited by Ashy (edited 03-29-2002).]