scream while in heat?

does anyone's cat scream while in heat? ik it's normal for them to meow loudly while in heat but my cat screams like she is in really bad pain. I have had unspayed cats before and heard them meow but not like Morgan does. it's especially bad at night. I am going to get her spayed I just have to finish saving up and take her to her first check up apt (which is today) but I feel really bad when she screams like that. is there anything I can do in the meantime to make this less painful for her? thank you.