Help?

Me and my so have been ttc for About 6 months now. And nothing. This month we are trying to have sex every day or every other day. My fertile window started on the 1st of this month. We had sex on the 30th of January, 1st and 2nd of February. Should we have sex everyday or every other day?  My fertile window ends on the 7th of this month and I'm suppose to start my period on the 20th. I just need some advice /: how did you ladies get pregnant? Every day or every other ?