Braxton Hicks contractions

Polina • Got married in Oct, 14. Jointed Glow in April, 14. We are having baby boy due Oct 1st.
Hello ladies, I am 23 wks pregnant and I felt my fist Braxton Hicks contraction. My uterus got firm and in lasted less than a min. My question is, is this too early to start having them and also do I need my midwife know or is it completely normal. Any info would be greatly appreciated. Thank you.