for any very busy wl/ml is once a week, for the rest is every 2 weeks.

'''my doctor recommended only every 3 months unless showing symptoms''' ... if you visit shops every week and you have Ginza service, this is a very wrong advice.

-urine test for chlamydia, gonorrhea, mycoplasma, trichomoniasis and full UTI.
-throat swab test for chlamydia, gonorrhea, mycoplasma, trichomoniasis.
-also, throat swab test for staph and strept infections and common cold viruses.
... these tests are super easy and in three full days you have the results, and you play safe.

So, if you visit the shops every week and you do 'diamond service' you need to do the above tests at least once a month [and especially in case you have any bb] or the next day after the first symptom.