Hi Hadas! When I went in for my blood draw, I had about 70 vials and they told me several times that it was less than if you donate blood. So 30 vials shouldnt be much (well compared to giving blood anyway ). Also, one other thing, because I kept asking, they said if it's not safe to draw too much blood, they don't do it...which is why they kept telling me it's less than if you donate blood.
Maybe you can split it up? I split mine up (because of an insurance issue) but I didnt do the entire repro source kit so it was easier to split up (I did part with them, part with Questlabs) so not sure if you can ask about doing the blood draws separately. Maybe too late to ask them about it now.