If they were in your pants, your prayers were valid and correct. But if it was on your underwear and it was dry sperm, then you should make ghusul and pray all the prayers again since you had woken up.

I woke up to pray fajr and hours later,i noticed dried patches on my pants and unsure what it was..do i have to do ghusl and repeat fajr?

Purity | September 1, 2015 2:34 am
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If someone made a mistake whilst performing wudu, for example, missing washing the next step that follows i.e. she washes the hands before the face. Or forgets to wash something and she remembers when she finishes making wudu. Do we have to repeat the whole wudu again?
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A woman is pregnant for 3 months…one fine day, she observed slight bleeding…then can she offer salaah..??..Is taking bath compulsory..??…as this is not periods….. also can she read quran.. plz advise..