Ways to keep him going?! ๐Ÿ™ˆ HELP

I could really use yalls advice on this one ๐Ÿ™ˆ husband and I had sex Saturday night, I took an ovulation test Sunday night and thought it was close to positive so sex time round two. Then took another yesterday morning and definitely positive! Soo got on my lingerie last night to surprise him - we started and he literally went soft right in the middle and couldn't finish. Said we had done it enough and he was tired ๐Ÿ˜ we've never had this problem and been married three years. We've been trying for almost a year and I'm irregular so never sure when I'm ovulating ๐Ÿ˜ฉ I don't wanna push him but is there any tips y'all can give so I can get him going tonight? Or should I just wait another day? I don't wanna miss our chance - HELP!!