Suggest Remedy For Delay In Periods And Increase In Size Of Stomach

hiiiii. i am sneha .iam 17 . i have my periods on december 20.... and in jan. ihad some brown discharge.....but no periods.HPT results negative. but i am not sure. today is 2 feb and no periods i have intercourse with my partner on the last day of my period in december... my tumy is little bit larger .... plzzzzzzzzzzzz help me by giving advice... i am so worried i will be gratefull 2 u. plzzzzzzzzzzzzz. i cannot go to gynacologist also so plzzzzzzzzzzzzzzzz help me mam as soon as possible plzzzzzzzzzzzz mam.