33 weeks pregnant and very constipated

Ta

I'm 33 weeks and 3 days pregnant with twins and have been extremely constipated the past week. I am so miserable at this point. I vomit when I eat because nothing coming out the other end, I have been taking stool softeners but they are not working. Is it safe to use a suppository? Or does anyone else have another suggestion that will help me out asap ?