If you are seeing breeding activity as described, there is a good chance that mating has occurred. I have only witnessed actual copulation once with the frilleds, so they tend to be somewhat discreet. If you are seeing the females on the ground a lot it means that they are receptive. If not, it could just be territorial behavior displays with the bobbing and head circles.
Females blow up like balloons when gravid, but it can be a little hard to tell when egg laying is going to take place. Some get lumpy, but a lot of mine just look blown up. It is important to have a spot ready for them, because they tend to go down, dig and lay. If they do not have a lay spot, they could egg bind. Just watch for digging. Sometimes the females go off food for a few days prior to laying.
Some females lay once per month, some every 80-90 days, some only once. It really seems to depend.
Best of luck
Dana