I can't seem to get pregnant!!!

I can't seem to get pregnant!!! I got regular periods between 28-30days... Sometimes I get busy on ovulation day and ... Next month... I'm back to mensturating... I try track my cervical mucus, but it doesn't feel like to follows a cycle... As I get far too little Cervical fluid:( I'm 38 yes of age... Maybe I get a day of egwc! I'm so sad! :( 0roblem is I can't get busy on an alternate day basis as I study, work, housekeep, and take care of my first child who is 7. Had a miscarriage in sept 2018... And i can't seem to get pregnant again! ... How do u busy ppl get busy in the sheets when u r busy on your life? I used to track ovulation once a day, but I hardly for a positive result ... But I know that u need to test X2/day with opk kits... So I lost hope .. I now try track the Cervical position too... Today I felt it low... So I know I'm again not pregnant! Uhhhh! ... Any suggestions?