The light bleeding and vaginal itching could likely be attributed to a post-D&C infection. I would recommend you go for a gynecological examination and treatment. 

There isn’t a high possibility that you are pregnant. For pregnancy to occur, the sperm must get to the vagina and not just through touch on the outer parts. Also, the fact that your period came in time is a positive sign. If you’re still anxious about it, you could take a pregnancy test just for assurance. 

Pinworms are tiny worms that infect the intestines and can sometimes spread to the vaginal area. They cause itching and redness. Medication can eliminate them, but it's important to wash bedding and clothes frequently to prevent the infection from spreading. Always remember to wash your hands before eating.

Vaginal bleeding of any kind might be a sign of many conditions like vaginal infection or cancer of the cervix. A gynecologic visit is necessary for an evaluation and correct diagnosis. If you have a blood-stained vaginal discharge, you need to see a gynecologist immediately.
 

YES, there's A CHANCE of PREGNANCY as SPERM can survive for 5 DAYS.. It's recommended to take a pregnancy test if you MISS your PERIOD... 

It's probably a sign of implantation bleeding, which occurs when a fertilized egg attaches itself to the uterine lining. To get the most accurate results, it is recommended to wait until about a week after your missed period to take a pregnancy test.