Did you watch them the whole time, every second? Did they mate?
If yes/no - not pregnant.
If no/don't know -> it could be, only way to tell for sure is wait one month after last time you made that mistake, and be prepared no matter what.
If yes/yes -> Congratulations, quite likely you'll be wading knee deep in baby bunnys soon
It also depends on the buck, some figure out quickly what to do, my new buck needed 3 weeks with the girls.
Anyway, it sounds more like a social interaction, like grooming, or if tufts of fur are flying and some chasing is involved it's more about establishing their hierachy. Evil eye, humping, short chases and occassional tufts of fur can be quite normal - but make sure you give them places to retreat to, options to go out of each others eyes (each of my pairs has 2 hutches, connected with a tunnel, or at least high shelfs and hidy houses). It shouldnt be a constant hassle though.
Then there are false pregnancies with nestbuilding and even plucking fur (their own).