Weird symptoms what does this mean

this is my first month ttc and I'm only 2dpo but am having the weirdest symptoms such as painful pimples, cramps, lower back pain, headache and a little nausea. Some of these I get before my period but I'm not due for 13 days and my period is extremely regular and never more then a few days off from the app so I'm very confused. Does anyone know what this could mean ?