That was one of my signs of pregnancy actually. I grew completely anxious and stressed, out of nowhere. I had already dealt with my 2 back-to-back car accidents back in April (neither my fault) and was in physical therapy for my back when I couldn't shake the extra stress.
I knew something was wrong or at least off because I'm pretty even keel at all times and absolutely believe in letting anything that bothers me out as it happens lol. It's not healthy to internalize anything right? So I started looking at other possible issues. Pregnancy was always the first thought. I began concluding that I was the whole month of June. I waited until the end of the month to take a pregnancy test and "Ta Da!" it was positive. The rest is history lol.