When did I ovulate?! Bad acne, am I pregnant already?

Ok, so I started taking these test strips everyday starting the day after my period. This is our first month tracking/trying. I forgot to take pics between the 5-9, probably because they looked just like CD11. So did I officially ovulate in CD16 since on CD17 there is clearly only one line? Also, for the last couple days I've been getting pimples everywhere! I didn't have acne as a teenager, only when I was pregnant with my DD 8 years ago. I have no idea why the sudden breakout. Could I be pregnant already and it's just my hormones changing? I'm on CD21 now. I'm dying to take a HPT but it's still too early, right? Any thoughts on any of this??