Ovulating with Clomid

Kari • Husband is 39, and we have two boys and are TTC our first baby together
I am on day 4 of Clomid, 4 days since then end of my AF. Yesterday my ovulation test was bright and both lines bold. Today, not so much. Second line is barely showing. So I'm confused as to when I should ovulate or if Clomid changes normal ovulation times. 
I bought more ovulation kits and preseed to help. Just wanna see what u girls think!