Thanks for the query.
Some amount of pain abdomen is common in pregnancy
The possible causes are:
-Round ligament pain
can occur due to stretching of round ligament due to increasing size of the uterus. It is usually felt when sudden change of position occurs like standing from sitting etc.
-Braxton Hicks contractions
are painless, irregular, infrequent contractions.
Usually these are harmless and pain will subside soon.
If your pain increases or any associated spotting etc occurs better to consult doctor