Yes, by all means try Tricomin, nizoral shampoo (possibly a Keto cream too). Essential oils are another option - Rosemary, Lavender, Thyme, Cedarwood in a Jojobo oil base.
I'm not sure why you would have to stop Rogaine while pregnant unless it might affect the blood/heart action of an unborn child. I haven't seen any research on this.
Have you had your blood work done and your thyroid action checked? If not, please do as this can be a common cause of hair loss in women. The only other treatment I see recommended for women is Spironolactone.
Good luck with it - hair loss is a curse, male or female.