Periods

Me and my fiancé have been trying to conceive for a short time and I’m not well informed of the whole trying for a baby concept because it wasn’t something we were planning to do until we were older.

My question is:

Is it still possible to conceive if I have my period the week after trying to conceive? I’m worried that it won’t work because of my period 😖😣 idk if this makes sense but please help! I’m having multiple panic attacks a day over this. Please help. Does it still count (is that the right word) if I take the test next week? Or will it show as negative anyway cause of my period? Idk how any of this works!!