So my boyfriend and I last had sex on the 15th of July and we were very careful to use a condom that we thoroughly checked. The weekend of July 28-29-30 I felt very sick to my stomach and just not well but haven't felt anything since. Although today (August 9) I came down with a sudden fever out of nowhere and started throwing up and feeling very bad. My period is 5 days late although it is not rare for me to be late 2-3 days.

Any thoughts?