Help. Little tmi.

So my fiancé and I have been TTC for 5 months now and I finally think I am but worried that I'll get a BFN. Last month I had a very unusual period. It only lasted 3 days and very light. When it's normally 5-7 days and extremely heavy. According to glow I'll should've gotten my period last sat. I had some cramping but that it. I have felt nauseas for the past month. Tender breast for 2 months. Lately my breast have been getting very sharp pains(possibly growing). Heart burn on occasion along wit headaches. I am little over weight but do exercise and drink plenty on a daily basis. I am not sure if I should wait or take a test. So please post any helpful comments. Thank you for taking your time to read this.