Unprotected sex. Of this discharge now?

Hello one of my best friend had sex not actually sex as she didn't break her virginity it's just that the couple is not sure about did guy cemen went inside her or not. But yes dey didnt break their virginity it happened on 29th of august and her periods date was 19th of august couple had no idea and went with the flow without using condomsThat night itself Of 29th she took an ipill with in 12 hours to avoid future consequences after that she had feeling of vomiting, nausea dizziness and abdominal pain for about three days after taking ipill and then she got fine and went for prega news check on Monday 4th sept and again on 7th September the result came was negative. everything was going calm and all she was waiting for her periods which is to be happened on 19th of This month and today all of sudden she found bloody discharge or say small few blood clots on her panty so what is it? What is this happening? Is she safe and out of danger? And what is the cause of this discharge now? Help