Can sex make you dilate

Jasmine
I am 32 weeks and after me and boyfriend stop having sex I start having contractions and so I went to the hospital and they told me I dilated 2.5 cm 
After spending two hours there nothing change
Now I am just in pain 
I was already 1 cm and have been at 1 cm for over a mouth 
My pregnancy is already high risk 
This is my third pregnancy and I had my daughter , second pregnancy, at 32 weeks - a little freaked out right now
I am curious can it make you dilate 
Even  though this my pregnancy every pregnancy is different my 1st I didn't have sex during my pregnancy-my second I did but I went in to labor for other reasons 
I need to know 

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