Period or Implantation Bleeding?

Me and my girlfriend had sex on 3rd October near to 4:00-5:00 pm. We had intercourse twice during the period. Both the times, I ejaculated outside. We were afraid , So I gave her Ipill next day at nearly 17th hour at 9:30am on 4th October. She didn't receive any withdrawal bleeding in the next 10 days. We were worried because everyone on the Internet said that they experienced Withdrawal bleeding. On 20th October her period started with heavy flow with excruciating pain in the abdomen. The Color was blood red. However she saw a brown jelly like clot, with her period. To overcome the pain on the first day she had homeopathic pulsatilla mother tincture twice. In the evening the flow was less and even the flow was controlled a bit. But on the second day the flow happened quite less. with period like abdominal pain sometimes and flow following it. Today is the 3rd day and her bleeding continues to flow similarly. But the cramps are still there. What can be the reason? Can she be Pregnant?