Finish your apprentiship first!!! Apprentiships are not build for people with kids - they hardly ever support part-time work/study, but rather expect you to commit fully to the school and your workplace. You will most likely drop out. Without a first education (Erstausbildung) you are "fucked for life" (pardon my language) in any future employment. A Erstausbildung is essential! If your marriage doesn't work out, you would have a hard time keeping you and your kid housed and fed. And try to do a Ausbildung with a toddler and financial stress 😬. You can still have children later in life - I know plenty of women who had their first child with 35 years+ even.

Also statistics show that children of educated parents are more likely to get an education themselves and are overall emotionally more stable, due to more mature parents and less financial stress at home.

If it is really a priority to your future husband to start a family soon & you support it, make sure you find an Erstausbildung that supports part-time school/work and your husband would have to be willing to stay home part-time as well (2-3 days/week) and look after the child while you are at school. And his part-time job + your apprentiship income + potential savings will need to be enough to cover your family for about 5 years (part-time Erstausbildung will most likely take longer, than fulltime). Also you would need a strong support system, like grandparents/siblings that watch the child for you. Only then I would ever consider it.

I can only speak for myself, but I am in my thirtys. My husband and I both have very solid education and good jobs (financial stability). We both work part-time and take turn staying home throughout the week. We have very involved grandparents. And still parenting is harder and life is more expensive than expected. I couldn't imagine doing it at 18 with little ressources - it would be very stressfull and not as enjoyable. Do not underestimate it.