17 weeks and pain on one side all day

So it started off as an uncomfortable feeling this morning and now its turned into constant slight pain on my right side which is where the baby stays ALL the time (I have a doppler and check on them every other day and the heartbeat is always on the right).

Is this worth contacting my doctor? I'm a very worrisome person and this is not a feeling I've had before. I'm going to stress so hard about this until the pain goes away or I see and talk to the doctor. Do you think they would even see me? Or even do an ultrasounds to check?

What could it possibly be? I've had cramping a majority of my pregnancy and this doesn't feel like cramping.