Pregnant?

My boyfriend and I had sex on June 10th (one of my peak ovulation days). We used a condom but not the whole time and after he went some was coming out of me (it didn't seem like the condom broke though, maybe just some leaked out somehow). My period is due tomorrow, but the past week I've had mild cramps, low back aches, severe headache, hot flashes & starting throwing up this morning. I usually do have cramps a day or two before my period comes but none of the other symptoms I've been experiencing. Would it be possible to get pregnant even if using a condom? if any escaped the condom it was a very small amount and only came out the other end so not sure if any even got inside of me.... I obviously only need to wait until tomorrow or next day to see if I get my period but with all these other symptoms I'm just a little curious what is going on! TIA!