Trying to determine if I ovulate

Brittney
In June I took ovulation test for most of the month trying to determine if I ovulate or not. My sister purchased a box of ovulation tests and was able to get a clear reading (she did get pregnant during that ovulation cycle) she gave me the remainder of the tests and I tested for 28 days. I got very faint lines but no super clear positives. I have not tested again since then because I was so discouraged by only having faint lines. (I attached a photo from the faint double lines I did get) Do you have to have very dark double lines for it to be a positive reading or do faint lines count? Should I re test and when is the best time of day to test?