Really need some guidance, please help

I'm 5 weeks pregnant today. Yesterday I had sore boobs, cramping and excessive thirst (what I thought were normal symptoms) but today I've woken up with my boobs feeling back to normal, no cramping whatsoever and I'm not so thirsty. My partner and I have been trying for 2 years and I'm so paranoid that I'm going to loose this one. I have a mild headache today but that could be anything. Any insight would be most appreciated!