Just curious.read online many women say their period cycle is like this ex: 29 39 28 40 27 41.do they have less chance of pregnancy?wut the problem?

Period variations: You period is fairly regular, and there is probably no "problem" : emotional/physical stress can interfere with ovulation timing, and ovulation precedes a period (unless pregnant of course) by 14 days or so: if ovulation is delayed , your period will be also, producing the variations you have stated. If you are trying to become pregnant, get an ovulation kit which will help with timing .