How To Check For Pregnancy?

My boyfriend and I had protected sex 5 times this past month. He wore a condom the whole time, never shot in me, never touched me after shooting away from me, and did the water test to insure that there were no holes in the condom. He said there weren t any holes, but I m still paranoid. However, I was supposed to start on August 5th, 2016, and I was 4 days late. This is the second day of my period and I ve had pretty bad cramps and heavy bleeding. It s heavier than normal. I came home yesterday and got into bed because of cramps and a sore throat, but it turned into stomach pains and really bad nausea. I threw up 3 times, and it was nothing but liquid. I only ate one time yesterday and that was at breakfast. I also have a sore throat, my ears hurt, and I feel weak. I ve had a fever of 103 all day today. My period has sorta eased up and it seems like I m almost finished. It s only been 3 days! (My normal is about 4). My periods are sorta irregular. They re either 4 days early, 4 days late or on time. Endometriosis runs within my family, also. Could I be pregnant? Can you be pregnant and still get a period (late)?