hey girls... im having a little trouble deciding if i should test or not...

lately ive been having cramps and sore nipples on top of nausea for about a week or so. i am currently on day 50 something of my cycle and normally ive been getting af on day 41 or 45. i chopped all my symptoms up to being a sign that af was coming but it didnt come on the days its normally here so i took a test on the 41st day of my cycle and it came out negative it was a $1 store test so im unsure how reliable they are but now im getting these temps on my chart that im just not sure what i should do......can yall help or tell me if this has happened to u