Needing advice/support

Brittanny • Im 23 and trying to have my first baby :-) me and my fiancé are super excited to start this chapter of our lives
Hello everyone, I'm new at this, I'm 23 and me and my bf are trying to have our first baby. We just started trying Tue. Any advice is greatly appreciated. Also can you get pregnant right before your supposed to start your period, or has the 'window of opportunity' already closed?