Nerve wrecked.

I’m 4wks6days pregnant and I keep taking test to make sure my lines are still darkening as if it’s gonna tell me I’m gonna miscarry again. I feel cramping every now and then, I get tired but can’t sleep, and I get headaches every now and then. should I be feeling more symptoms by now? do I need to be worrying rn? oh and I have been having back pain for the last few days but it gets better when I lay down, sit down, or put a heating pad on it. I’m just freaking out...sorry