Advice please

Rachel • Mommy to 2 boys and expecting baby number 3!
Me and my hubby have a almost 2 year old little boy and we are trying for baby number 2. According to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, it said I should have started my period yesterday and or today and nothing so far. I took a test and it said negative. What should I do?