Confused - need input

My husband and I have been ttc only 2 months now. I thought I was pregnant a few weeks ago, my boobs were huge and very very very sore. However that went away and on Saturday I got what I thought was AF. However it was light and only for the morning, then it was completely gone Sunday and back Monday morning, gone by Monday afternoon. So far gone this morning. pregnancy test yesterday was a negative. It was First Response so even if early it should have shown a positive by now right? Anyone have any clue what’s going on?