Using a breast pump during pregnancy

I am 5 weeks pregnant and am pumping for my 7 month old daughter, who is getting both formula and breast milk (my milk supply has dropped since getting pregnant). I have been stressing about whether or not I should continue pumping or to transition my daughter to formula and stop pumping all together. I have read tons of articles which have different opinions. Some say it's totally safe to continue pumping, some say it's safe until 20 weeks, and some say not to do it at all. Can any of you moms share what you did and/or your opinions? I want to do what's best for both my babies. Thanks so much for any help!!