What would you do?

So I asked my MIL to pick up a prescription for me this afternoon. When I went to meet her, she said “hey I also got you your birth control refilled, I don’t need no more grand babies right now”...We’ve been off bc for almost a year now, and TTC for a few months. She said she wanted a summer grand baby. I don’t want to stop trying and then wait until August (so the baby would be due next May). But I also don’t want her to be upset. What should I do?