Period/puberty question. Only women answer please.?

So I'm 16 (my birthday was in February) and I'm pretty sure I just had my first period. I had barely any vaginal discharge a few months ago, I have no armpit hair, small breasts, I'm short and I have hair "down there". I've been having irregular spotting (basically every other day) and cramps for 4 days. Is this normal for a first period? Should I get checked out by a doctor? I need some womanly advice! And advice is much appreciated (: