I had this too. But I had actuall bleeding and passed a clott which I thought was the baby. Turns out I just have a severe Uti. Get it checked mama! Xo blessings
If you are in your third trimester, it is possible that you are losing your mucous plug. It's a good idea to call your doctor and let them know the changes in your symptoms, if you are past 36 weeks or so, your are probably gearing up for labor soon. If you are earlier than that (like 30-34 weeks or earlier), your doctor may want to put you on bedrest if they feel labor is progressing too early or make other recommendations.
Hope this helps
it could also be an infection... you can go to any pharmacy and buy an infection kitt before you keep stressing on it