Most people may say: do not invest on cloud mining, most are scams or ponzi scheme, or it's not profitable as the difficulty increases over time and there are a lot of costs for maintenance, electricity or pay fees for bitcoin transactions.
That's true, that's why you should be careful about choosing the company which offers cloud mining, so far there are few trusted cloud mining such as hashflare and genesis mining, I won't recommend to invest on both if you don't know the risk of investment. Just put some money that you are willing to lose, but according to people who have invested on both, yes it does pay contract holders.
May I ask; which cloud mining that you have invested? as you said the contracts are only for a few months.