Sciatica pain 8dpo

So I’m ttc my second baby. With my first pregnancy I had terrible sciatica pain. This subsided as soon as I delivered. He is 18 months and I have not had any sciatica problems since. I’m 8-9dpo and the last few days my sciatica pain is back. I have not had any injuries or done anything strenuous. Could this possibly be an early pregnancy symptom? I know it seems crazy but there is literally no explanation other than the hormone relaxin causing things to act up. Would love to hear if anyone has experienced this?