Hi! Not strictly a lesbian here but in a lesbian relationship. Yes, lesbians have top/bottom dynamics typically in the "one doing the action" vs the "one being acted upon" across various different acts. Most switch it up ("vers"), rather than identifying primarily as tops or bottoms. If you are strictly a top or strictly a bottom, you're described as "stone" as in "stone top" or "stone bottom".
Very important that these are completely different roles than dominant/submissive/switch, which are BDSM terms and describe a more psychological aspect of a relationship than the more physical top/bottom/vers.
If you're in the US, you may also want to look into FMLA leave. Certain states also have programs that stopgap poor employer parental leave coverage. Definitely see what is available to you!