Spider bite? Bruise?

I don’t know anything about Washington spiders first of all. The state I’m from doesn’t have any big spiders. Yesterday night I was playing with my dog before bed and saw what I thought was a bruise. I showed my husband thinking I was clumsy and somehow bruised the back of my knee and he thought it was a spider bite. Looked it up today and it could be. It doesn’t hurt and I don’t have any symptoms like fever etc. I don’t know if I should be worried or not. I’m 8 months pregnant and have a few dollars left of my deductible left so I could get myself in a better spot by going to the doctor (what kind of doctor even do you go to?) but I hate risking going to the doctor during the pandemic for nothing. Some sites suggest taking Benadryl. I can’t see any bite marks but we have had a few large spiders recently but we sprayed down the exterior of the house with spider repellent or whatever. Thoughts??