SadMom,
If you get pregnant, I'd probably recommend holding off on minoxidil. Some of it does get absorbed into your blood stream; do a search on previous posts; there are a lot of people who stopped minoxidil because they got sympoms like racing heart, headaches, etc.
Start with 2%. 5% will increase the likelihood that you'll shed and/or irritate your seb derm more. I've read on posts that people with seb derm get a lot more irritated due to the minoxidil; so you might be better off waiting until seb derm clears before you use it. Or, do a little patch test for a while and if it doesn't get irritated, move on to the rest of your scalp.
Seb derm can be caused by stress, even if you don't think you have stress. Your body goes into fight-or-flight and then pumps out cortisol. The quality of the oil (sebum) on your head changes and is higher in cholesterol and triglycerides. Your seb derm can be related to being a new mom, the hormonal changes, etc. One thing that soothes the scalp is to do a one part to one part mixture of peppermint tea and cider vinegar. Rinse it through your scalp after you shampoo with your seb derm shampoo and then rinse it out. It should help.
I know that you're probably desperate to start a "solution" right away; just make sure that you research and know the pros and cons before you jump into anything. My personal experience has found that a lot of doctors don't know what they're talking about when it comes to hairloss, so you need to be the gatekeeper of what treatments you choose, and what you choose to put into your body. If I went on the blind faith of all the doctors I've seen, I'd be screwed.
Blessings to you.