i am in the theseven days of my peroid and me and myboyfriend have had unprotected sex

My husband and i had sex while he was home for the first week in September last year i haven't had sex until last week .i have been experiencing movements in my belly having spotting every now and then sometimes .i have two kids .i have shortness of breath my tummy is swelling am gaining weight i did an home pregnancy test and it said negative .i really need some help please?