I've been hiding my pregnancy...

So, I'm 34 weeks pregnant with my 4th and I've been hiding my pregnancy from everyone but my husband and one close friend. My husband had a vasectomy reversal done and we were blessed to have gotten pregnant quite easily. We didn't tell anyone about the reversal because we knew it might not work. Then we didn't tell anyone about the pregnancy at first because I have a history of miscarriage (3 live births, 5 miscarriages) so we just wanted to be sure the baby stuck. I reached my second trimester and my sister in law lost her baby at 21 weeks so we couldn't find an appropriate time to share our news so now here I am at 34 weeks and I still haven't told anyone. Needless to say, I'm going to have to tell them eventually. So, my question for you ladies is...how should I tell people? I feel so awkward at this point and just don't know what to do. Lol. Like I'm super pregnant and I just don't know how to finally announce. No, no one has suspected a thing. I've been very careful about what I wear and how I hug people lol. It's getting hot out though and I can't keep hiding this but after waiting so long I don't want to just be like "oh, by the way, I'm pregnant." So, help a lady out ! We don't know the sex of the baby either. We want that to be a surprise at birth.