26 female having lower abdomen cramps, headaches, back ache, sore breasts, discharge and i vomited this morning for no reason, could i be pregnant?

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 about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing her regular period. Her primary care or Ob-Gyn doctor can evaluate, if there are persistent or worrisome symptoms.