Preterm labor

Back story.. i have a 4 & 3 year old.. 10months apart born at 35 and 33 weeks. No reason with the first one and the 2nd one I had a stomach bug and it threw me into labor. I have a son that’s 11months and was born at37 weeks. I’m currently 28weeks pregnant.

I FEEL like she’s head down but I can never really tell.. also never know when I’m in labor until 6+cm

My pelvic is always hurting especially to walk or stand up even stand. My butt bone hurts so bad to the point it takes me a few mins to stand up and then fully stand all the way up. I’ve been sick for a week and still have a bad cough, when I cough it’s so much and so hard that I feel like I could push a baby out (obviously I don’t think I’m dilated but it just FEELS that way down there) discharge comes out when I cough though.

My question issss.. Can excessive hard coughing make you dilate?? Or go into labor because I definitely don’t want to have her this early.