We gave our cat advantage but didn’t think it was working too great so we gave it to him again 2 weeks later. We also have frontline but I’m not sure if it’s ok to give it to him only 2 weeks after the 2nd advantage dose. I’m also doing the normal things to take care of the infestation in the house like vacuuming and spraying but I still find fleas and baby fleas meaning the lifecycle is continuing. Is it ok to give the frontline?