AF due 4/4 ??

Lauren • 31, partner is 35. We have three children, William 10, Georgia 2 & Eliza just born. I work with domestic abuse victims in the north east of England. Partner is a roofer/joiner.
Hello I am currently on cycle number two TTC number 2. My AF was 3 days late and it's normally bang on however I have two apps that are telling me different things now. My <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says my period is due 4/4 and my fertile time is the end of this week & next week. But my other app says my fertile time is now and my OV date is Saturday. And my period is due end of March. Arghhhhh! Lol I'm going with the latest start date and have opks tho. Who else. Is due 4/4 ?