Twins?

This is my second pregnancy and I’m only 3 weeks 3 days along. I got my bfp at 7dpo which I thought was really early but shrugged it off as I was so excited. Then, came the nausea. I’m literally nauseous every morning and having uncomfortable pressure down there already. I had NONE of these thing until 9 plus weeks with my son. Is it possible I could be pregnant with twins? Or has anyone experienced these symptoms this early with a singleton pregnancy?