So I recently was able to easily do a 3 minute breathold without contractions but I started to do hard co2 tolerance to improve my pb but this did anything but. After doing them solidly for 2 weeks I took a break for about about a month. I am now experiencing very early and strong contractions that happen at about the 1 minute mark, each contractions are about 1 second apart. I don't know how I can fix this as it happens on every breathhold.