What am I feeling? Pulsing on bikini line

[Bluesea14]

26 weeks this week. Have been experiencing a pulsing/heartbeat sensation around my bikini line.
I don't think it's hiccups because it lasts for around 20 mins at a time and there is around 2-3 seconds between each beat.
Could this be my abdominal adora? It's driving my crazy!

Could be the baby is positioned quite low down and is pressing on a vessel so you can feel the pulsing more than normal!