Pregnant ? Or not?

I just recently moved in with a friend (female) and it is known hat ya females periods like to sync together . Well me and my bf are trying to make a baby and I’m not a week and 2 days late on my period and I don’t want to get too excited about being pregnant. It might be too early for symptoms but my friend hasn’t started hers either (she isn’t sexual with her partner yet) and we both usually start around the 2nd of each month but we both have not started .. what could this mean ?