Oh yeah, been there.
We had reasons to believe we would have difficulty conceiving, so we decided to start trying as right after we got married. (Our reasoning was that, if we just couldn't conceive and/or decided to adopt, we were probably looking at several years before we had our first child, and while there's nothing wrong with being older first-time parents, we wanted to start younger, since we wanted more than one child.) And, may I add, we were engaged for almost 2 years, so it wasn't like we rushed into anything.
Anyway, we were married in April, and I was pregnant by October. My son was due in June, but was born 4 weeks early, in mid-May (2 weeks and one day after our first anniversary, to be exact.)
Add to that the fact that he was a big kid (7 lb 3 oz at birth, which isn't that big, but is is for being 4 weeks early) and he just grew, and grew, and grew - everyone thought he was older than he was - yes, we got the sideways looks and raised eyebrows.
There were times when I wanted to just flat out say, "No, I WASN'T pregnant when I got married!" because it was that obvious that's what people were thinking.
Even if he was full term when he was born, I STILL couldn't have been pregnant at the wedding anyway; but of course, no one wanted to hear that.