Treated and felt like an outsider

Inlaw and my hub's sibling has always treated me as an outsider, despite even when we are married. However, it is due to my pregnancy that im carrying a baby boy and now my in law are trying to get closer to me. But that only makes me feel uncomfortable. Argh... having to know their motive, it just makes me feel so uneasy. I rather we stick to how we were in the past which is more natural. ? Anyone has the same problem?