Period mia

So this is the list of all my periods for the year. They are normally irregular and my husband and i use pull out method which i know isn't protection. Last month right after my period i felt like a had a uti but according to the dr only a little bacteria showed up and they did a pregnancy test which was neg and i did one last week that was neg and according to this app i shouldve started yesterday but sometimes im 4 days earlier than it predicts and have been a week later than predicted. Had sex the 3rd and 14th of August.