At 30 your chance of pregnancy per cycle is 20%, at 40 it’s 5%.
Per cycle stats are rather useless, I find.
At 40, there is a 44% chance a woman TTC will be pregnant within a year.
90% of women 39 and under TTC will be pregnant within two years.
More useful.
(The latter was a factoid on the NHS fertility page, not sure if it's still there. Quoting it has caused me to receive vitriolic ridicule and be called "crazy" by some posters on here. Though in fairness I think none of them was the one who argued that per cycle stats were "ever" stats for 5 pages, using bold, capitals, exclamation marks etc and then disappeared when some links were posted. Possibly a few two many vinos that evening).
Anyway op, even at 31 I think it's best to concentrate on a robust campaign to meet and build up a relationship with a decent partner.
Because it takes time to get to know someone properly, and time to build up a relationship, and time to get married (if you choose to get married, and unless you do a quick, casual.wedding) and time to TTC. During the process you may meet men whom you have to end things with, because they show you behaviours that would be very undesirable in a partner & Dad.