okay so lovely ladies 💜

please help me figure this out so a little back ground on the situation so I had my birth control removed Dec 1 started my period Dec 2 -4 I have very short period mostly 5 days sometimes 4 days but I have very irregular periods have my whole life but had my youngest son in March 2017 I'm a mother of 5 well we decided to have our last baby all my kids we're planned so we started charting and using the app so we knew when I get pregnant how far along I would be normaly I would be waiting awhile for my period to return but it did the next day so the app says my next period is supposed to start and using this app in the past has worked great but I'm just wondering does the second period really count? I've had two periods a month many times before sometimes even three but I've taken many test way to early lmao patience isn't a virtue for me lol and I was aware was to early but pregnancy hits me quick I know all most always right when I'm pregnant but I've been so Nasoues and eating all the time

and so so so tired tested last night still negative but I also didn't soak the stick enough... but my question is when should I retest?