Need Help!!??

Ta

I'm new to all this. I was 4 days late and this am got my period. I'm so sad was hoping this was my month. we are trying for our 2nd baby after having 3 miscarriages. I want to make sure my ovulation days this month are correct to up my chances to get pregnant this month. App says fertile period is from 24-30 and ovulation day as 29th. what's best days to have sex? and should I use ovulation test to confirm those days? If so what best test to use and when do I take it. This is last month for me hubby wants to give up too much stress he says and pressure on him. But that's besides the point. I need this to count for sure. lol Thank you ladies for all help and support.