Did I ovulate early?

Jillian
Hi everyone! This is my second month tracking my bbt. Does it look like I ovulated a week early? 
I've been taking opk's all this week, but the test line is barely visable. Last month, I was able to get a positive opk that matched up with a temperature dip the day before the ovulation temperature spike.
I went off of birth control in February, and my cycles have been getting longer and longer. The last 3 cycles have been around 40 days. So I'm a bit surprised that I my cycle would suddenly be a week shorter.