16 week appt

So technically I am 16 weeks and 4 days but that just seems to be the way the doctor schedules my appointments, until my ultrasound which will be at 19 weeks and 3 days. So just shy of 3 weeks I go back. I have been a little worried the last few days as I noticed when glancing at my chart(belly measurements and weight) that my belly hadn't grown any in the last 3 weeks. So of course me being the worrier was worried that maybe something had happened. So right away they did the heartbeat and picked it up right away! yay! This time baby had a heartbeat of 145. Last time was 156 and time before that was 143 so staying pretty consistent but they say it gets lower as you progress. So my worries went away. Plus the doctor felt my stomach and said my uterus was growing, I just had stronger stomach muscles so baby was growing but more so inside and hasn't pushed my belly out yet.
Next thing they asked is if I felt baby move yet. Well, there might have been 1 day. I was standing at the kitchen sink and felt a weird feeling in my belly on the left side which I have never felt before and the doctor said that probably was it! So that was last week!
Then the doctor went over my blood and urine from my 12 wk appt. Everything was fine except they found out my blood type is A-. Which only 15% of the population is negative. So, I need to find out what Eric is and if he is + then I have to get a shot at 28 weeks that prevents my body from making antibodies against the + positive blood, since I have - negative blood. Which she said is nothing to worry about. They said it isn't as much of a concern for first baby as it would be for 2nd baby.  Because if my blood touches this baby's blood then my body makes antibodies against it and if we have another baby and they have + positive blood then my body could fight against it. So yeah, just a little hiccup.
Blood pressure was 118/62 so it looks like so far everything is going pretty well, except for this dang heartburn. Boy does that sure hurt!
Ok, well back to work. Just wanted to fill everyone in!