Cramps

So the other morning I had been woke up by a huge pain in my belly, I'm 6 weeks 4 days pregnant, and when I went to the toilet to check and see if I was bleeding I start to gag! I haven't had morning sickness yet! So after the toilet I went back to bed and then an hour later the same pain in the same place! I have cramps near enough everyday but nothing like them 2!! What can this be due too? I worry because it's my first pregnancy and I don't want anything to go wrong! Please can someone give me an answer to why I have cramps like this?