One question for both stomach movements, is when you had your "period" in February, was it a normal period or was it light?
It is very common for women who are pregnant to think they got their period, but just very light because often women spot.
However, if it was heavy than the chances, like tlkittycat1968 says, are very low that you are pregnant.
Also consider anything else that has happened recently in your life.
Are you under added stress?
Change in diet?
Did you have the flu recently?
All of these things and more can create havoc on your body.