Could i be pregnant if i touched my boyfriends penis and then touched myself but ive come on my period a day later and its heavy but i have stomach pains and sickness?

The only way you could have become pregnant is if you touched his sperm and put in into your vagina. And, if you had your period, the stomach pains and sickness could very well be from your menstrual period. Also, this could be severe guilt and concern about the fact that you may be pregnant. If you are truly worried about conceiveing a child, don't have sex.