I have unusual spotting i think im pregnant!;

My hubby and i have been trying to get pregnant since last september(when i had come off of BC after 3 years). It's is now july and no luck so far. I have never been pregnant before. My last period started on the 13th of june. on the 4th of july i experianced light colored pinkish spotting in the middle of the night on a trip to the bathroom. The next morning it was even lighter and was gone by the afternoon. I was having slight cramping and noticed sharp pains in my uterus during the spotting. since then up to today(july 6th), i have the feeling i would get if i was about to get my period(light cramps, bloating). I am not yet late for my period, but the spotting threw me off a lil bit. I have never experienced ovulation bleeding. My cycle is usually between 26 and 28 days. My hubby says im more emotional with tears instead of rage (i usually have hormonal rage during PMS). I've been tired and sluggish. I feel hot most of the time. I'm nausiated mostly from the time i sit up in bed in the morning to about late morning...later on in the day im nausiated again and experianceing bad headaches. I am a smoker and ive noticed the cigarette smoke has been making me nausious(which is good because i emediately put out my cigarette.) Aside from all of the pregnancy symtoms ive noticed (which can also be related to PMS), my breasts do NOT hurt but are very sensetive recently(rarely do i have sore breasts even during PMS). My cat has even been EXTRA affectionate and meowing at our bedroom door for the past 2 nights(we keep the door closed, hubby hates cat hair!) He follows be everywhere while im home all day. I was also told by my gyno when i was 16 that i have poly-cystic ovarian syndrome...but i never really had any symptoms of it...never got a second opion cuz i didnt believe him. Is it a possibility i can be pregnant? when is the best time to take a hpt? i want to wait and see if i miss my period but im so anxcious to know!! how early can i take a hpt??