Okayy. So my boyfriend and I had unprotected sex last night, but he pulled and ejaculated like two minutes later. Than this morning, we had unprotected sex again and the same thing happened. And my period started either last night, or this morning, I'm not sure. But I'm extremely worried that I might be pregnant. My breasts aren't sore or anything. I normally don't get cramps, and I'm starting to get them. What do you think the chances of my getting pregnant are?

Chances of pregnancy are well, chances. Any vaginal sexual intercourse poses a pregnancy risk. You can become pregnant from pre-ejaculate. I would suggest waiting until next month to see if your period as late, and if it is, then it will have been long enough to take a HPT or go to a doctor for a blood test to find out if you are pregnant or not, but ANY vaginal sexual intercourse poses a pregnancy risk, eve with contraception, but if you are not planning on having a baby soon, you should really invest in contraception.

Let me also say that if you are pregnant, you would not be experiencing any physical symptoms this fast. It takes about 3 days for the sperm to reach the egg, then another 2 or 3 days for the fertilized egg to travel down into the placenta, then yet another couple of days for implantation to occur.

So the absolute earliest you would have symptoms such as breast tenderness, tiredness, etc would be at least 2 weeks after conception.

J9 is correct, if you are feeling anything today it is from fear and worry.
But without any protection what so ever, it is merely asking when, not if.
You can become pregnant from the pre fluid, so if you are going to be sexully active, please get and use proper protection methods.