You asked

Can hot water harm sperm?

Sperm count can be affected by a number of factors. One of them is indeed hot water.
There are many urban legends and wives’ tales out there about conception. However, the legend of hot water impeding your man’s fertility is not one of them.
If you can keep your partner out of hot showers or baths, his sperm count will be higher. This gives you both a better shot at conceiving. When his scrotum is roughly one degree cooler than the rest of his body, his sperm count is at its best. That’s why the testicles are located on the outside of a man’s body.
This is simply one of those differences between men and women. Women’s bodies protect their fertility because everything is deep inside your body, where its temperature can be maintained. The testicles are positioned externally, which indicates the need for the area to be slightly cooler.
What should you do if your man simply must soak himself each night? Turn down the water temperature to around body temperature (37 degrees). This will ensure the safety of your fertility efforts.
If he has been consistently bathing in very hot water, do not despair. The damage to his sperm count from hot water is not permanent.
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More questions

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Ectopic pregnancies are fertilized eggs which implant themselves outside of the uterus. They must be terminated and can indicate future fertility issues.
Ovulation is the period during which you can conceive. Tracking ovulation can be tricky, but you can increase your chances of conceiving through math, prediction kits, or simple scientific observation.
Implantation bleeding is not a common experience, but some women do report small amounts of blood with or without cramping roughly a week or less before their anticipated period.
Pregnancy tests are only as good as the execution. Read all instructions to avoid getting inaccurate results on a home pregnancy test.
The best over the counter kits measure luteinizing hormone (LH).
There are many things that you can do to increase your chances of getting pregnant.
How STD’s can affect your pregnancy, your baby and how you should deal with them during pregnancy.
Taking care of your body before and during pregnancy
Ovulation occurs just about two weeks after the first day of your period.