Miscarriage aftermath

Sarah • TTC #1 for 2 yrs, did 4 rounds of femara, 1st IUI on 11/15 & it worked!!! ? Due 8/8/15 with twins!! ?Praise God! ?
How many of you have had an early miscarriage? I just had one on Jan 11, AF was supposed to be here Feb. 9ish & she just showed up today, 18 days late! Does it usually take a while for your cycle to get back on track? Veryyy frustrated bc I don't know when my fertile days are now bc my cycle is so jacked up!! :((