No Period Until Now

Is it possible na buntis ako? Aug. Ako nanganak then nov. Last na regla ko.. Dec. Until now wala pa ako niregla.. I took pills for 1month(nov-dec) kasi umuwi hubby ko.. I stopped the pills when he returned but until now d pa ako niregla.. Nag pt ako dec. Clear negative.. Then nag pt ako this month 2 and both clear negative.. But im still worried dahil d pa ako nireregla. Ano ba to?