What Are The Side Effects Of Undergoing Frequent Abortions?

Hi i had abortion by abortion pill september 2013 at 15 weeks was most worst expireance of my life n wouldnt advis any one to do this it was worse that givin birth to my lil girl now 6,,i have just found out i am pregnant again which i have been extra cafefull dont bo how its happend im scared that if i get abortion i might not be able to have any more children as this would be my 4th 1 does this affect future pregnancys