Renting should I worry?

So we are renting a house and have been living here for almost 8 months. My due date is september 23rd and our lease ends october 1st. I haven't told the landlord I'm pregnant. I was going to wait until August to discuss renewing the lease and the details about my personal life. Well i get a letter in the mail saying they want to do a walk through of the house on Thursday. I already have the crib set up and boxes of bought baby stuff in the dining room. They did a walk through in December so I'm really stressing about why they want to do another one so soon. Its not like we do drugs, get the cops called, have parties or alot of traffic or anything close to that. We have never been late on payments i actually paid 2weeks early for next month before i recieved this letter. The only thing i can think of is my husband fixed the backdoor and spent about 40 dollars and had it taken out of the rent, he took pictures of what he did and showed it to them we asked them to fix it six months ago and they never did...I'm not even sure why I'm so worried. I just feel so stressed by it!!!