not like blood more like a charcoal colour black and thick..

Hi,

I've got a serious problem now...... this could silly to u... but i really dont know what to do....

I had an intercourse in the end of feb and then i took Ipill (just before my husband went to official trip).... then i never had period un till march 13 -15 (only 2 days) but that was not like blood more like a charcoal colour black and thick.... after which i dint get period till date.... what should i do?? more over i had intercourse reluctantly with my husband after he came from trip... thats on the 3rd of april... i have not got my periods... i really dont want to get pregnant.... as i m doing my masters and have to much commitments... my husband wud be very upset more over he wud have to go bk end of this month again.... plz help... more over now i am feeling vomiting sensation, giddy, feel something in stomach.. i dont know if this is just tension...



thanks
anyo