nervous might be pregnant

I think it's too early to tell. been feeling weird but I started my period so I though oh ok that's why I'm all over the place. but today is day three and I'm usually still bleeding heavy. I'm not. I changed my pad it was brownish blood and when I wiped it was brown no red at all which is usually day 5 for me. Also been feeling nauseous and extremely gassy and emotional. This happened once before with my first son. I'm going to wait and see what is going on tomorrow. if more of the same I think I should go get a pregnancy test.