How do you know if you are pregnant if you are breastfeeding and havent gotten a period yet?

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My question is that I have 4 month old twin that I am breast feeding and I haven’t gotten my period yet. I know that is normal, but lately I have been feeling a little nauseous and I have been getting cramps and then weird movement. Could it be gas moving through ? I called a nurse and she said everything sound normal. Im just afraid of getting pregnant again so soon.

take a pregnancy test. When I was having my children (the first 3) I used to get those sorts of sensations – feeling like you are preg. I never was. I always got preg immediatly when I stopped nursing. I joke like it happened the same day I weaned, lol. I took several preg tests just for my own peace of mind.
When I was BFing I took a HPT every month. I didn’t get my period for seven months afterwards so the only way I could be sure was to take a pregnancy test. I had similiar feelings as you describe though. (wasn’t pregnant)
Sometimes women don’t get period while breastfeeding. But just in case to ease your mind take a pregnancy test. BTW the same thing happen to me after my pregnancys