Too Early for Symptoms

Hey ladies. Okay I know there are quite a few of these posts, but I was wondering if anyone else thinks these may be pregnancy symptoms, or if I'm just imagining them (we've been TTC for a while). Anyway, for the past few days I've been feeling nauseated and gagging after I eat and today it was really bad. Also my boobs have been sore and itchy on and off for a few days. The only thing is that I've have problems with constipation since having my first son (sorry if TMI) which sometimes makes me sick after I eat, and the sore boobs pop up a couple of times a month for the past 3 or 4 months. I've been off BC for nearly a year (since last April) and we've been really really trying (tracking calendars and using ovulation tests) for the past 3 months. I'm only 7 days past my ovulation date and I'm not supposed to start my period for another 7 days. Also for the last day or so I've been craving seafood and orange juice like I did with my first pregnancy. So is it too early to feel symptoms? With my first son my boobs hurt for about a week before I took a test and it came back positive. I was 4 weeks pregnant at that time, but I don't remember if I missed my period or not. I guess not or I would have known at 2 weeks instead of 4, right? So, since these are the symptoms that tipped me off the first time, I get excited every time my boobs hurt. I've taken a test the last 3 times and they've all come back negative. Last month I thought I was pregnant because I'm pretty sure I had implantation bleeding, but then about 4 days later I had a heavier than usual period (sorry again if TMI) which was a couple of days early. I'm going to wait a few more days before I take a test this month. But what do you all think? Sorry this is so long and thanks for your help!