11 dpo..when to test

Eva

my boyfriend and I have been ttc for almost 4 months. I took a dollar general test at 9 and 10 dpo and may have had the slightest of the slight vvvvvvf line but not 100% sure. I have 4 days until af is due. would it be a good idea to spend the money on a frer or should I stick with the dollar general $1 test? I'm so anxious to know now, that I am so tempted to buy the frer but if the dollar general ones are gonna work the same.. opinions?