How many times a day should you have sex if ttc?

My husband and I have a beautiful 13 mos old little girl. I stopped birth control, bc at the time, we planned on having a child soon. We had one big event planned and wanted to start trying after that event. We used condoms in the meantime except for 1 time when we didn't feel like it and went back to using condoms the next day. That one time was enough. I got pregnant. So, never actually planning a pregnancy, how often should we have sex? More than once p day, every other day? We've been doing it once p day for the last 10 days and plan to do so until I'm supposed to get my period.