[shep53]

At this time of year egg laying adults are more likely so a cheap easy and very quick egg count stands a good chance of a result, for more cost you can get a vet to take bloods, still not 100%  .   Just because you are in afluke area does not mean your land has fluke , i have fluke and yet each field has different levels of infection ,dry fields very low or nil to my worst field which 50% floods,   my next door neighbour has no fluke at all on the same type of ground