Small Hard Bump?

I am 20 weeks, And I noticed last night that on my upper belly (a little bit below my breasts) and almost to the middle... there is a very tiny, smaller then a pea,, hard spot. When I touch it it seems to go mostly away but it comes back.. Just wondering if this is anything I should be worried about or not? I'm a first time mom so every little thing scares me! Thank youu

maybe a lymphnode? id tell your midwife or OB next appt. also i have a pea sized cysts on my neck, maybe its something similar?