Feeling confused and need help

So a day before valentines day I decided to hang out with my boyfriend . Things led to things and I brought a condom but it didn't fit him. We ended up doing it four times in the back of my car. Now I've been feeling pretty crapy lately. I've been having cramps, fevers,morning sickness, headaches and body aches. He used the pull out method and I fully understand that that   Doesn't work all the time. I'm just really confused and need some opinions . I also understand that it's only a few days afterwords . I just need to know what people think.