If you had a dvt/blood clot, what were your symptoms?

This is random but I'm 37 weeks pregnant and suddenly started getting this severe pain in my right foot. My foot is slightly swollen and red. I don't do very much right now because I'm on maternity leave. Alls I did was go to a doctors appointment today so I can't really picture it being an injury. It's been bothering me for hours now. I'm being a hypochondriac, can this be a sign of a blood clot? I'm more worried that is painful and slightly discolored (red). I also don't want to drive to ER and pay a 200 dollar copay for no reason lol. If you have a dvt/blood clot what were your signs or symptoms?