I have lots of Africans and 90% of my mouth brooders are safe to strip at 21 days if you lost count their bulge will get darker and you can usually catch a glimps of eyes in her mouth. I use the tooth pick method some don't like it but I've done it many times and haven't injured a fish yet I have striped non jumbo Cyp's this way also.
Like already stated if you don't want the fry just let her spit in the main tank at least she will get the hang of holding full term.