I'm confused

I've been feelin twitches in my lower abdomen and my breasts and nipples have been sore for two months now. I went to a Dr last month as I suspected I was pregnant but da Dr said der was nuthn. I wen on my periods on the 1st of this month but my periods wa extremely slow that I didn't even have to use a pad dey also lasted for 3days only and I normally go for longer and I'm heavy flow. My breasts are still sore and have now become veiny I'm also getting cramps as if I'm gon go on my perios (periods) AGAIN. I'm scared to go to a Dr again,I jst Dnt wanna be disappointed again. I Dnt know wat to do next,pls help!