I got my peak today and just hours later (I test twice a day) it’s back to negative. Is it normal to have only one positive and shortly after the surge begins to go away ???

What does this mean ?(if anything)

I see women have positives for 2 days at a time or it gets darker and darker while still being positive. It just seems very short to me and I’m just wondering if it still means I’m ovulating and such. Honestly any information helps because I’m overthinking at this point 😅

Also my boyfriend and I BDed last night at like 2:30 am ... twice ... would that be enough for a potential pregnancy given I got my surge today ?!

Thanks in advance ❤️❤️❤️