irregular period & trying to conceive

i have been trying to get pregnant for 4 months now this month will be 5 my period is irregular and honestly im starting to get worried a little because my period is very irregular and i think it might be a reason why im not getting pregnan also because i dont have sex so often sometimes i forget to have sex in my most fertile day according to this app .... i talked to my husband about it and we promised we would try a little harder although i dont want to end up having sex just to have a baby i want to be able to enjoy it ... anyone here with a irregular period pregnan or with babies please help !! 😪