How can you tell the difference pms or implantation!?

My period is suppose to come in 2 days. I’m 11dpo... been having weird symptoms.. such as swollen ankles which never ever happened to me. Back pains.. upper and lower or a pinching back pain. Abdomen cramps.. thought it may have been my period coming early.. cramps were similar to a period coming on but mild. Normally if I had cramps ibuprofen takes it away but it didn’t take these away. Little pinching and tingling sensation in abdomen.. how can I tell if it’s implantation or pms. Cramps was all day yesterday. Now it’s off and on...