I had unprotected sex and my periods ended 2 days before the Intercourse there is very less chance of the sperm getting inside I had levonorgestrel within 6 hours and I bleeded a little bit and a day after I bleeded little bit more with some particles .being concerned about this I'm really getting way too stressed and going weak. Are their chances of me getting pregnant and if there is what should I do to prevent it please say. Thank you.