Breastfeeding question.

So since I was like 20 weeks pregnant and I’m now 37 weeks today I have had colostrum leak from my boobs and if I express it easily comes out. But for the last few days maybe even a week I have had like nothing come out if I express just to see that it’s still there. I don’t remember that happening with my first two kids. Has anyone else had that happen and still go on to breastfeed just fine? I didn’t have a ton of success breastfeeding with my first two and am worried maybe my milk won’t actually come in at all this time or like it’s drying up or whatever. I know it takes a couple days for your milk to come in after baby is born I just found it weird I could always squeeze some out and now it’s nothing?!