I'm not going to have intercourse with my significant other for a few weeks
Why are you abstaining from sex with him now?
I don't want to rush into it.
Your body your choice. If you don't want to have sex with your SO then it's fine not to. If you forced yourself to do something you didn't like you would regret it.
What if he wants to have sex with me?
If he wants to have sex then you should just tell him that you aren't ready yet. I'm sure he'll understand how you feel and will wait. It's always okay to say no.