Confused

On February 4, I had my cycle it was normal. On the February 12 we baby danced and on the February 18 I spotted. I am having little symptoms of being pregnant, such as cravings (foods that I haven’t ate in a very long time), hella tried and want to go to bed early, and a little pain in my lower back. A little breast tenderness. A while back ago, my doctor told me that I have a 7% that I can get pregnant to become pregnant I will have to take fertility supplements. What should I do? Or what does this mean. I am 42 years of age.