Welcome to the forum.
first please calm yourself. Getting stressed out over this will only make your period late which will cause more stress. So take some deep breaths and try to relax. What is done is done.
As for the pill, you would have to ask a pharmacist or a doctor as to how it works. Both have to keep your confidence.
Like so many women before you, you have a 50/50 chance of being pregnant, if the truth is being told. Since you are SO nervous, you may have your doubts about that, I think.
Whatever the outcome learn from this experience and practice safe sex habits for your peace of mind in the future. You are in control about what happens to your body, not someone else. Do not let anyone tell you differently. If you do not know what safe sex habits are, talk to a pharmacist or look them up on the internet. You are worth the effort.
Stay strong and keep posting here, we care. You get a reply from someone that used the pill and can give you more clarity, I still recommend talking to a professional about it.
Be still and know there is Peace.
Kabir says: "Student tell me, what is God? He is the breath inside the breath". from the poem Breath.
DX: reverse Trigeminal Neuralgia;Cluster headaches; Atypical face pain; raynauds;complex PTSD; recurring MDD,disassociative disorder;