Determining Ovulation Day...

I got my first positive opk last night, and I just tested again around 7:30 PM and got a strong positive again. My bbt chart confuses me a lot–maybe I just don't know how to read it. My temps are always really low – I never even break 97°F. There are a couple points where my temp dips so low it's off the chart and then peaks to almost 97°F. I am taking meds for hypothyroidism, so I attributed the low temps to that. See the pic below. 
Is Glow right in telling me that I'm ovulating today or did I already ovulate? I'm so confused because I'm still getting a strong positive opk. I have also been having sore boobs, light cramping, feeling really tired, and have a sensitive tummy.  We've been trying to BD as much as possible (see the hearts on my chart pic, lol). 
Any thoughts/advice is greatly appreciated, as I'm very new to this!