How Far Is Safe? Please Answer!

I believe I have a head cold. My husband had it a few days ago and now I have it. It's been horrible and I've been miserable! Aside from all the usual congestion, runny nose and sneezing....now I have sore muscles and a mild fever. Now the sore muscles I'm sure are from the intense sneezing and tensing up. I feel it every time  and after a few hours of rest, the muscles are worse now that they've relaxed. Now on to the odd part. Well I can't sleep but when I do I wake up really hot so I took my temp, first time was 100.2 so I got out of the covers to cool down and in about 5 mins it was 99.2, so I ignore and go back to sleep. 2 hours later I wake up again hot, take my temp and it's 100.0 but sure it went back down as I started to cool off as I lay here awake. I haven't taken anything for my cold since I read first trimester is crucial to try your best not to. I am now 7 weeks and just a little unsure. How far do I let this go? Do I ignore this odd fever and just try to rest this off?