When should I tell him?

I felt nauseous this morning and my period was a day late so I took a test and it's positive! I don't really dare to celebrate because I've had miscarriages before. But I was thinking if I should wait to tell my partner until Valentine's and it will be the nicest surprise for him. He always gets me something way too nice and this year I'll hopefully be able to get him the best gift ever: this baby. Other pro is that if I wait to tell him the pregnancy goes further along and the risk of something going wrong will be less. If something would go wrong I will still tell him it happened and get his support. But the cons are I would be lying to him and I would rob him of the happiness of this positive for as long as it lasts and I don't know if that is right. It's also a pretty long time until Valentine's. It isn't only my child, it's also his, so I feel like I'm kind of obligated to tell him. He might be upset if he finds out I've known about it and did not tell him? What should I do?

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