A good time?

Question

When is it a good time to have sex after finishing my period because i don’t plan to get pregnant right now

Answer

Anytime when you use protection, never when you don't.

Answer

Then use protection

Answer

If you don't want to get pregnant, use birth control. You have a chance of getting pregnant any time you have unprotected sex, even if that chance is lower at some points during your cycle.

Answer

None of us can tell you when you will be fertile.
You can do the fertility awareness method to prevent pregnancy without birth control. It can work well for some, but you have to be very diligent in your tracking. 
It is somewhat risky because of the room for error and would only be recommended if you are ready to accept a surprise baby.
You can’t just look at the calendar and know if you are fertile based on what day of your cycle it is. Everyone’s fertile window is a little different and it can be different month to month and change unexpectedly. The days it shows on the app are just an average, so you are fairly likely to get pregnant if you just use that. 
You will need to track your personal ovulation time carefully using multiple other methods. I choose opk test strips and cervical mucus, but there are many other ways you can look up. And you really shouldn’t be having unprotected sex until you have been tracking for several months and are certain you are doing it correctly.

A good time?

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