Unprotected Sex

So my boyfriend and I had sex multiple times and just about every time, it was unprotected. The very first time, which was two weeks ago, it was unprotected but I took an emergency pill like an hour or so later. Three days after that we had sex again and the condom broke. He pulled out the times. Two days ago we had sex with a condom but five minutes after that it was unprotected. I've been feeling a little under the weather like a small cold. Today I woke up with a terrible headache and feeling nauseous. I'm aware that those are morning sickness signs and I'm FREAKING OUT. I don't know what to do. Is it too early to assume I'm pregnant? Is it too early to take a pregnancy test? If it is, when should I take it? 
Help!!!!!