Had my 16 week appt today, kind of sad that i couldn't see my baby but i did hear the heartbeat at…

Had my 16 week appt today, kind of sad that i couldn't see my baby but i did hear the heartbeat at 136. Jan 28 ill find out the gender hopefully....im soooo excited....But kind of worried that my BP was 138/70. why is that? never been high before