Could I Be Pregnant? Community

My last period was back in Feb. My periods have been erratic since having my 4th baby Jan of 2011 as she is still nursing. I have had no morning sickness (which I had bad with my other kids). My only real pregnancy symptom was frequent urination. I had been fighting a sinus infection since November and it finally spread to one of my molars. I figured all the peeing was from my body trying to cleanse itself. I finally had a root canal about a month ago (May) and was put on amoxicillan (sp?) and given a script for tylenol with codeine, which I took for 2 days. Prior to the root canal I was taking extra strength tylenol and advil, for the pain with the last week before the root canal taking 3 or 4 pills at a time to get any pain relief.

About 2 weeks ago I started feeling movement in my lower abdomen. Still thinking I wasn't pregnant I figured it was just bowel movement, though it sure felt like quickening. Last Mon, when DTD with DH I could feel the hard ball of my uterus between us. Since then I have noticed I can feel the top of my uterus about an inch below my belly button and my pants have been slowly getting tighter. I haven't done HPT as I'm quite sure I'm pregnant and already have and appointment for my annual obgyn exam in about a week and a half.

I'm happy to be pregnant, we wanted to have one more before I'm much older. I'm just worried about the effects of all that medication on a developing fetus. I've always known by my first missed period that I was pregnant and taken precautions to avoid unnecessary chemicals and medications. Sorry this post is so long. I'd appreciate any feedback about this.