Fertile week?

So confused right now. eve is telling me I am in my fertile week. My other app that's apart of eve is saying I'm a week out of my fertile week and my other app Ovia says that I'm 2 weeks out of my fertile week I am so confused. My last period 28th of April* and it was heavy and just stopped completely and I've been ttc but it's whatever. My question is which one should I trust?! 😳