how do you keep the baby making from feeling like work ?

I'm trying to follow the app ( I actually use 2) and the ovulation tests , clearly my Husband doesn't know when my fertile time is, so I feel like a drill sergeant when the time is here. it doesn't help that our schedules are very hectic and a lot of times opposite of each other plus we have a 4 and 3 year old already ( they happened right away, second one on the pill, so this time it's been harder) so I feel like we're just , getting it in, for lack of better terms. It's become work .