Truth is absolutely noone knows how things will pan out. Could be a long drawn out labour, could be emergency c-section, could be v quick. First time labour can be - first hint of anything to actually holding my first was less than 4 hours. Wore dress I went to hospital in, just thrown back at the business end. No poo. Oh firmly told stay up top and did. 3rd degree tear and much bleeding, but midwives kept whipping away puppy pad things from under me so not too graphic if you see what I mean. Yes it hurts and you may scream, but will quickly get told to channel that energy down into your chest to aid pushing.
Noone, including op, knows how she will feel or what she will want in the actual moment because it's totally new, totally different, totally unpredictable for anyone, and each person experiences things in a unique way.
My lovely oh irritated the hell out of me with concern and being touchy feely but a snappy "stop touching me" was taken in good part and stopped that! But having him there was a huge source of support when in massive pain as placenta had to be manually removed. And with dd who was born v prematurely and whisked away to NICU without me seeing her, it helped knowing he was with her and one of us knew if she was dead or alive whilst I was in theatre myself. And surely if baby is sadly stillborn it would help having partner around?
OP, you are totally entitled to feel as you do and it is your choice and your choice only. But make sure you talk to your partner because it may really hurt him and that needs resolving asap. (Then again, he could be relieved!)
In your shoes, I personally would let him know my concerns and let him come to hospital and be around in early stages of labour. But send him out the very second you stop being comfortable with having him there. That way you leave yourself open to all options.
I really would recommend having someone with you if possible, even if not partner. Friend? Mum? Doula? You just honestly do not know what it's going to end up being like.
But ...your body, your choice. End of story.