Ejaculated inside of overweight (not obese) girl with pcos that was not on birth control. few times. doesn't have normal cycle. chance of pregnancy?%%

Nobody knows, and...: It really doesn't matter if the statistical chance is 5% or 10% or 15% or 20%..., because the reality remains that she might get pregnant. If not wanting a baby and if this happened less than 3 days ago, one can talk with her about taking emergency contraception pill(s), but those may not work as well in an overweight girl. One can take her to her Ob-Gyn doctor for an IUD, which works pretty well.