Could somone be pregnant and get a negative pregnancy test?

ok i saw my period november 22 then i didn't see it till january 2 then march 1 which was not normal at all it came the 1 in the morning then d 2 noting d 3 i d night slight pink d 4 completely gone and about 2 weeks now ive been feeling movements everyday now it feel like bobbles in my lover bart of my belly sometimes for some hours i wouldn't feel anything then all of a sudden is like i popping pop corn in there i took 2 pregnancy test 3 weeks ago it came back negative am planing to go to the doctor this week just wanted to see what u guys think of this or am not getting any king of morning sickness only thin is when i belch a little bit of vomit comes up with it one day me and my boyfriend was arguing and all of a sudden it was like i was popping corn in there i have a 16 month old boy and normally he dose get up plenty times in d night but these days i dont even hear when he get up or when my boyfriend bring him on the bed cause his crib is in our room also just yesterday my boy f turn and told me u dont even hear when the boy get up these days u knock out cold and am the one who normally get up hen my son gets up but not all d time it dose be like popping sometimes it will be like popping then like 1 little kick or someting and so on