myself and my boyfriend rubbed all over each other with clothes on last day of my periods ,i have a doubt that his semen has entered me through the clothes and i have got periods for 5 days after 4 weeks. its my strong feeling that they are periods. and after 7 weeks i see that some change visually in my stomach that it has been bulged some what.i dont know whether it is due to pregnancy or i dont take food at correct times. can u please clarify my doubt?