Did you use any protection during sex? If not, then ya, you could be and need to take a test. Some women during early pregnancy do have what they describe as what feels like menstrual cramps. You can accurately take a test 2.5 weeks after you had intercourse so you would be able to find out now. A home test is easy to use but do read it within the time frame they tell you (don't let it sit and read it later). Take the test and let us know the result and we'll go from there!