Advice please!!

I'm 4 weeks 6 days along, I literally just woke up a quarter to 2 am with the worse set of cramps. I was genuinely concerned I was having a miscarriage, no blood and they went away after about 15 minutes or so. I'm concerned though because anyone that knows me knows I will sleep through EVERYTHING but I was just woken up by the worse cramping feeling I have experienced in quite some time.

I will admit I didn't have as much water today as usual, I had one pop at this concert I went to this weekend, and whoever was obviously smoking pot in the row in front of my sister and I was making me feel nauseous. I just feel like today was the first rough day I experienced pregnancy wise.

Any advice would be appreciated, this is my first pregnancy and I just want to try and do everything I can right. Thank you