Help 😩

Angel
We've Been Trying To Concieve For 2Months Now My Period Came A Day Late And Went Off Two Days Early . It Was Lighter Than My Normal Cycle Which Is Quiet Heavy (Sorry For The TMI) But My Stomach Has Constantly Been Bloated And Even My Fiancé Felt My Stomach And Said Its Harder Today Then It Was Last Week. When I Would Ask Him He Said He Never Noticed A Difference But Now He Has. I Feel Slight Throbbing Or Pulses On Each Side(One At A Time Tho Rarely) . I Have Been Having Lower Abdomen Pain And Nauseous Headaches Vivid Dreams and Sore Nipples But I Took A Test Last Week And Still Got The BFN. 
What Should I Do?Â