Off of webmd
What Do Braxton Hicks Contractions Feel Like?
Braxton Hicks contractions can be described as tightening in the abdomen that comes and goes. These contractions are typically not painful and do not occur at regular intervals. They do not get closer together, do not increase with walking, do not increase in how long they last, and do not feel stronger over time as they do when you are in true labor.
What Do True Labor Contractions Feel Like?
The way a true labor contraction feels is different for each woman and may feel different from one pregnancy to the next. Labor contractions cause discomfort or a dull ache in your back and/or lower abdomen, along with pressure in the pelvis. Some women may also feel pain in their sides and thighs. Some women describe contractions as strong menstrual cramps, while others describe them as strong waves that feel like diarrhea cramps.
There is a good little guide here is the link http://www.webmd.com/baby/guide/true-false-labor
check it out and if in doubt go to your hospital or call a nurse line
good luck!