TTC .. Vaginal Dry Spells

Hello! I am new here. Me and my husband have been ttc for about a year now and still nothing. Sometimes during intercourse I have dry spells... Ill start off moist then eventually be dry. I already have 2 kids from my prior marriage. I tried conceive+ about 2 months ago and preseed last month. still nothing.. any suggestions? After trying preseed I felt all the symptoms but still a BFN