Hi, usually pregnancy tests take at least 7 days after your missed period to show the truth. Usually leg and back pains don’t show up in pregnancy until you have gained a significant amount of weight, or if you have underlying medical conditions. my advice? wait a week, test. if it’s negative, wait another three or four days and test again. in the meantime, don’t stress out. stress over the possiblity of being pregnant will often present symptoms similar to those of the first trimester, which will only make it worse. And take care of yourself, just in case. ! 🙂