Unused pregnancy tests

I was in the habit of getting a pregnancy test almost every time I went to the store. We just started trying in oct I figured I would have to have a few normal cycles (while on bc I only had it every 4-5 months) now we're pregnant and I have like 4 tests left. I have 3 positive ones so I don't think I need to take anymore lol. But now I don't know what to do with them. Any suggestions?