Pregnant? Serious answers please ?

Okay so about 3 weeks ago i had unprotected sex. Please don't lecture I learned my lesson and that was the first time i ever had u.p sex. It was the last day of my period. I ovulated 10 days later (I know i did i was checking every night for C.M) and i ovulated the next Tuesday.. So Sunday to Tuesday is 10 days. My CHances are very slim right? Well I was supposed to get my period today and I didnt. But for the last 3 weeks i have been having very bad anxiety over it stressin about it too much. I havent thrown up yet and no implantation bleeding no sore breasts a little naesea but that could be from stress..?? what are my chances im planning to get a preg test but i just wanna know my chances.. SLIM 50/50 or HIGH please help I'm really young and I just wanna know what my chances r and trust me I learned my lesson.