Helpppp

Me and my fiance could use some advice. My last actual period was December 23-25. I thought I started again. In January it only lasted. From the Third to the fifth. And I just had some spotting. On the 21st. And now I'm really late. For my period. I'm going to say. I'm about 30 days late. And any pregnancy test I take says negative however I'm having massive. pregnancy symptoms. My nipples are hurting. My stomach hurts constantly. And my back also hurts. Any advice will be greatly appreciated.