Should I do anything if I have a low lying placenta?

I went to the ER for issues I was having last night and the doctor there did an ultrasound. I wasn’t able to see the ultrasound, but he said baby looked fine and also that I have a low lying placenta. He was pretty short with his answers and didn’t give me much information other than that. Should I be doing anything for a low lying placenta? For example, no heavy lifting/long distance walking?? I’m worried. I’m 15 weeks along