really scared that i could be pregnant :(

so on Sunday a guy friend & i were messing around around 5:30 PM and we were making out and all that. after a while, i felt something go inside me but i wasn't sure if it was his hand fingering me or his penis so i kind of thrusted like 2/3 times and it was in only halfway. after a while (like about 5~10 seconds) i realized that it was actually his penis and not his hand so i immediately pulled out. his penis was dry but i know that there could be pre cum and now i am deadly afraid. btw i'm 18 and the day this happened was the last day of ovulation and the day after was my fertilization day. i heard that it is easier to get pregnant during this time and even if you take the pill it will not help . what are the chances of me being pregnant ? on monday morning around 10 AM i went to the doctors told them what happened and i took the morning after pill around 11 AM . i heard that if this type of thing happens when you are fertile/ovulation, then the pill doesn't have any effect . is that true? i am terribly TERRIBLY scared right now because i have college planned in August and everything. when will be a good time to take a pregnancy test ? i am so paranoid right now it's Wednesday and i've been having lower abdomen pains (like period cramps), not a lot of discharge, & lower back pains. i also have the urge to keep going to the bathroom & i kind of have diarrhea :-( i'm not bleeding yet so does this mean the pill has not worked ?! also i took the pill about 15/16 hours after the incident which means the sperm could've already attached itself .

please give me some GOOD advice and i know i shouldn't have made this happen and i regret it sigh so just help me . i'm spending almost ALL DAY on the internet trying to find some good answers. i'm just more worried because this all happened when i was ovulating GOSH I'M SO STUPID ! i'm about to go get a blood test done (if it's confidential & free where i am ) with a friend . sorry this was so long .