Engaged this weekend, 6 weeks pregnant tomorrow

Ugh I am so stressing myself out and I hope this is pregnancy hormones or something. We are both 23 and saving to buy a house. This just wasn’t a part of the plan. We both were initially excited but I’m feeling overwhelmed thinking about what people are going to think and say because now it seems like we aren’t getting married for the right reasons. I feel so selfish because babies are a blessing, yet I feel mad. I’m mostly concerned with my horrible in-laws and I’m scared they’ll be upset we don’t own a house yet and that we are still so young. We have been together 3.5 years and have talked openly about wanting a lot of kids. Nobody makes my MIL happy so it’s not personal and I wish I didn’t care what she thought so much, but she can be so mean. To make matters worse, I don’t have a mom or anyone to confide in. I’ve always wanted to elope and say our vows in private so he and I could have an intimate moment, but he doesn’t want to upset his family by not having a wedding. Now this pregnancy just adds more chaos. I want to get married before I have a big belly in photos and I also don’t want to wait until after baby because I want to bear the same last name as my fiancé and babies. (That’s personal preference, to each their own). I’m so overwhelmed and I know I’m overwhelming myself. Plus I haven’t been feeling good like all day long so I’m getting frustrated.