Is it Possible?

Jan 13 - may unprotected sex po kami ni hubby, but he made sure na sa labas nya pinuputok and naghuhugas sya everytime. Jan 14 - 19 - niregla po ako (which is yun talaga ang expected date ko) and normal po yung dugo na lumalabas. As in marami pa din. Possible po kaya na mabuntis ako?