What can I take?

So, I’m only 7 weeks pregnant and was diagnosed with HG. I am taking Zofran and it has been a miracle!! However, now I am horribly constipated! I haven’t pooped in about 4 days and it’s starting to become uncomfortable. My doctor is honestly just a hassle to deal with, so I am in the process of switching doctors. In the meantime, is there anything pregnancy safe that I can take? I need a laxative for sure. I have been taking fiber supplements and eating plenty of fruits and veggies.