Is it time for a pregnancy test?

My short period has just stopped yesterday I still have sore breasts and my veins are more visible in my arms and breasts. My pulse is faster than normal, I checked it before I went to bed and when I woke up. Could a first response read my hcg if the hormones are rising this fast? Or should I wait another freakin week. Lol. I am so tired of waiting. And my stomach feels nauseous this morning. Or should I get the dollar tree test