You can do this! The frequent testing is the first step and it’s great that you are doing it. I have a CGM but didn’t use it exclusively during my pregnancy (no complications for me or baby, who was born at the end of last October). But you do need to feel comfortable adjusting basals and I:C ratios ALL THE TIME. I know the reluctance, it does feel weird, especially if pre-pregnancy your diabetes was pretty stable. But that’s the key. Don’t let more than 2 days of any one pattern (highs or lows) persist. Since you are on a pump (another great thing!), you have so much flexibility. If you’re not already super comfortable setting multiple basal rates and I:C rates and changing them, reach out to your care team, or a different knowledgeable support team (I didn’t use them in the end, but had Integrated Diabetes Services in mind if I needed additional help). Also, there are a couple of books you can read which describe some of the common experiences for women with T1D during pregnancy: Cheryl Alkon’s Balancing Pregnancy with Pre-existing Diabetes: Healthy Mom, Healthy Baby and Ginger Vieira and Jennifer Smith’s Pregnancy with Type 1 Diabetes: Your Month-to-Month Guide to Blood Sugar Management. While both those women had other complications pre-pregnancy, there is a lot of useful info in there to prepare you for some of the literal highs and lows. (There is also this one, but I haven’t personally read it so not endorsing it necessarily, but just for a more complete list: Diabetes and Pregnancy: A Guide to a Healthy Pregnancy for Women with Type 1, Type 2, or Gestational Diabetes).
I am currently quite busy with our 5-month old but if you have other specific questions, will try to reply within some reasonable timeframe. 
Best of luck, and you got this!