Confused and trying. PLEASE HELP

Yesterday I took an ovulation test and it came back clear positive. After that I took more just to be sure and after that first intial one all were not as dark. Well this morning (3-21) I took one first thing waking up and it was way positive there was barely a control line the test line was so dark, well then later today I took another two and neither one of them were no where near as dark. I use answer brand. Are they best at picking up in the morning? I'm new to this I just started clomid (3/9-3/13) and I'm at ovulating days and this is the first time I've gotten a positive at all.