Hi there userSG1400, I'm really sorry to hear that you're having a flare up with your ocd, that sounds really tough.
I can reassure you that there is no way for your sperm to have "spread all over" the clothing like you describe, nor have survived the washing process. This is because:
1) the process you describe would have completely destroyed the sperm, it cannot survive the washing process, the heat, the soap etc. just like washing would break down other bodily fluids, like sweat or snot.
2) further to this, washing garments removes things like sweat, dirt, snot, rather than spread it all everywhere, if it did, washing wouldn't achieve any cleaning at all.
3) Even if the clothing wasn't washed, the sperm would have died in the open air really quickly, and even before then, indirect contact with a sperm cell in this way cannot make anyone pregnant - you can read more about that in these articles here:
I hope this helps. Do you currently have support from a therapist for your OCD, and/or have any good coping mechanisms that you like to use?