Getting pregnant at 39 almost 40 is harder then I thought

God I am almost 40 on aug 19th and I must say wanting to get pregnant is harder then not wanting to and wounding up pregnant 🙄... I need some tips I’m currently on ovulation week July 26rh -aug 1 with ovulation day being July 31st so me and my bae has slept together tues not today at all but goin to Thursday and Friday hoping this month we get pregnant 🤰🏻 I had a tubal ligation 2013 to be able to have more babies 👶🏾 but I am starting to wonder is it goin to happen? I have 3 kids 1 son he’s 22 1 girl she’s 20 and my youngest is 18... I want 1 more that’s it but it seems to be hard asf to get pregnant 🤰🏻😭... help me out ladies