What is this?

I had a miscarriage in early September and went on birth control after to help myself heal both physically and mentally. I stopped taking it after the first month was over. It was the mini pill. We are now in a spot where we are ready to try again. Well last week I had very light cramping/brown/pink discharge when I wiped only for about 3 days. I took a test in that time frame and it was negative. Well today by boobs hurt so bad like the way they did when I was pregnant. Should I test again? In the middle of September I had HCG drawn and it was going down then a few weeks later had it again and it was what they considered negative. Should I reach out to my doctor? Test again?