What Causes Nausea And Terrible Heart Burn?

I am a 32 year old female. Last month around the same time I had upper mid stomach pain, upper right stomach pain and some lower right stomach cramping along with nausea and terrible heartburn and pimples on my face (which I rarely get). The pain lasted for about 3-4 days and then went away but the other symptoms continued for another week. My first thought was that I was pregnant since me and my husband were trying to conceive (we have one child). This month it happened again. I was feeling great for 2 weeks after my period which I had on March 5, we tried for the baby on March 18 and 19. Now since yesterday March 22 I start getting the same symptoms except for the upper right stomach pain. Thank you in advance for your reply.