help! can you ovulate on your period?

Ky
So my cycle is all out of wack this month. I finally started using ovulation tests and they showed that what glow was predicting as my fertile window was in fact wrong. I first started them about 10 days ago. The brand I am using displays 2 lines. When both lines appear on the test and are the same "shade" that indicates ovulation. Every day I use the test that second line gets a little darker. Today I started my period, and I took an ovulation test and the two lines are just about the same. Making me think I will ovulate tomorrow or the next day. 
So my question is CAN YOU OVULATE ON YOUR PERIOD?! 
I've read posts that said its not possible and posts that say it is possible. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> just kept readjusting to try to find my fertile window and didn't predict my period coming this soon. However my period came this time last month also, so it is "on time". I just need some help!!!! This ttc stuff is super confusing!