Anyone have a blood clot in leg late pregnancy?

I'm suspecting I have a blood clot in my left leg. It's more swollen than my right, tight feeling and starting to feel weird like the beginning of a charlie horse but the pain isn't there. It's 4am and I don't have a babysitter for my toddler so I will need to take him with me to get checked. Can I wait a few hours before going to the ER or should I be leaving now? Also these symptoms make me worry more because 3 days ago I was feeling sick (heart racing, nausea, headache that wouldn't go away with medicine). I haven't experienced really any swelling at all until now, almost 32 weeks.