Period and Babies

So about a week ago my boyfriend and i had sex using a different condom. After it was all said and done, we both looked and the condom had broken. The very next hour I went and took Plan B, then started spotting for two days after. Couple days after my boyfriend was scared so I took a test. Immediately it came back negative. I was supposed to start on the 2nd. I have had no signs of starting so I took another test and that came back negative, but that test was slower to show up. I havent had any symptoms of being pregnant either. Should I take another if I don't start by this weekend or what should I do? Help!!!!!