Am I overreacting?

I had to ask for advice as one of my good friends has booked a date for her wedding at the end of September this year . I’m due to give birth in about 10 days . She messaged me saying she would ask me to be bridesmaid but she knows most normal women don’t snap back to their bodies and didn’t want to put pressure on me as a new Mum so she wants to give me the option as baby will only be 6 months . & she’s come to terms with the fact that I probably wouldn’t be if they had booked it for this year so the option is there if i want to be a day guest . I feel so upset by this as I have put on abit it weight but I’m in no way big and I’ve already felt crap about putting on weight but it’s not like it’s the month after I give birth! Sorry for the long story x