OK glow I need advice

Jennifer❄ • My husband and I have a beautiful daughter who was born in 2016. Now we are wanting to expand our family.

AF is due ether tomorrow or Monday I took an ovulation test by accident I grabbed the wrong one. Well it showed a line so then I took a pregnancy test strip. Well it showed a fair line right off and as I watched the line got darker.

But I took a 88¢ Walmart cheapey and it was negative. So why didn't the Walmart one show?

(All were take with the same sample)