Hi Pregnancy is not possible following a non penetrative sexual act. The ejaculation of seminal fluid should take place inside the vagina to facilitate the easy passage for the active and motile sperms to meet the ovum to cause fertilization and thus pregnancy. Since you did not have vaginal penetrative sex, but he cummed near vagina (lower tummy) and if the semen did not enter into the vagina there is no chance of you getting pregnant. Heavy bleeding following a delayed period could be due to stress, emotional upset, change of diet, or certain underlying diseases for which you need to consult a gynecologist. Hope this answers your query.