How effective are cheap tests... and suggestions for pregnancy app

Hi ladies,

I am 5days late for my period and tested positive for pregnancy with Wondfo pregnancy test. I am not sure if am seeing things right and if my test is right. Can someone please assure me that this is true and also please suggest me with few <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> to track. Also is there anyone in the group with weight around 92lbs and have had a healthy pregnancy. This is our first baby and i am little worried.