No period but clotting im 16 i think im pregnant, my last period was also like this, but the first 3 days were normal but this time there is just clot?

Hard to guess...: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. An Ob-Gyn doctor can evaluate, if any unusual or worrisome symptoms.