This happened to my SIL. She cared for her DH for several years until he died of non-Hodgkins lymphoma. I'd ask her periodically if she'd had a checkup and she always responded, I don't have time.

Soon after her DH passed she was diagnosed with fallopian cancer, a rare type. She's had treatment, and so far so good, but the treatment was hard, same as for ovarian cancer.

It never, ever pays to put off checkups no matter how busy we are.

I'm glad we didn't lose my SIL too.