Unprotected intercourse but without orgasm, I got my period the next day

My guess is NO. You are NOT pregnant. I'm not a doctor but I'm a mother of 4 and used the rythym method for years to try to get pregnant and also used the rythym method to prevent pregnancy. My strong opinion is NO, you are absolutely NOT pregnant. From my experience...we are only able to get pregnant for about 3 days within the month. And the day prior to your period beginning is NOT one of them. I wouldn't worry. Again, I'm not a doctor but I am very confident in my reply to you.
Good luck! :)

I want to add to my initial reply to you that I didn't comment about ANYTHING else regarding STD's , having safe protected sex etc...etc...because you were clearly asking for a pregnancy related reply...and you didn't mention anything else. Otherwise I would have because you should be careful out there in this world. It's IMPORTANT to practice safe sex....to prevent STD's as well as unwanted pregnancies. I don't know anything else about you but I truly hope if you have ANY worries or concerns that you find a trusted person to speak to or post your concerns here so someone can help :)