June 7 through September 27 - hottest part of year. Rams should be fertile BUT, in the heat, sometimes they are lazy. Have you tried using a mating harness and crayons to see when the ewes are marked? Change the crayon color every 2 weeks and check for rebreeding. If one ewe is getting remarked every couple weeks while the other settle, it will be the ewe who may have something wrong. Do you have a backup ram? If not, just put Snickers back in with them. If you have a marking harness and crayons, put it on and see what happens. I wouldn't pay $28/ewe to do pregnancy checks or worry about pee strips. If he was fertile enough to breed half the herd already, he will get the other half now. I don't worry about pregnancy testing; I use a mating harness and crayons to determine when they are bred. By changing the crayon color every 2 weeks and checking very morning for new marks, you will see if the ewes are getting bred. I change crayons and leave the ram in until no one gets remarked for 3 weeks. You might want to keep a ram lamb next year for a backup ram lamb just in case.