Should I give up hope?

Vanessa
I'm irregular so I don't really know when I'm due. For the past 2 months my AF had fallen on April 26th and May 27th. I'm usually early but the last two months I haven't been. I have two apps that say I'm either due on the 24th or the 27th. 
I haven't gotten my AF but tested today and it was negative. Should I give up hope?