Ive been vomitting....acid like thing .... i dont know if im pregnant i think its too soon ..... i had sex and he injackulated in me the first time and then twice a few days after .... this happened sunday and then tues. ....... could this be a pregnancy issue because of the vomitting? ........ what are the chances? .... please help need answer towards this ..... i really dont want to get pregnant. ..... my last period was like almost three weeks ago if this info is needed