Is this true? Please comment

Pip • Pregnant with a little boy • c-section is booked for 4th July 2016 at 8am ✨
I've been told ovulation tests can pick up hcg also. I've been taking pregnancy tests and ovulation tests all week because I've felt off and my period should be here tomorrow. 
I took an ovulation test every day for 2 weeks and I ovulated then the line was getting less visible each day to the point the last few tests has only had the 1 line. Then today I've taken one and there's a faint second line (faint) I'm due on tomorrow so surely it's not the hormone that is there when ovulating building back up? 
Know I shouldn't use it as a pregnancy test just ran out and wanted to use up the rest of the ovulation strips..